wholesale jewelry silver china Which is better? High points of cost?

ray wholesale jewelry 1. It is not important to buy a diamond ring brand. It depends on the diamond certificate. If you are 50 points, you must choose GIA or other international certificates.

2. As long as you cut the diamonds at Very Good or Excel 1, you can see eight arrows and eight stars.

3. Various levels on the certificate of diamond, please read the following text (a bit long)

The shape of n diamonds refers to its correct contour shape, such as the shape of the waist layer, such as: round, olive, square, etc. Diamond cutting (Cut) is the first C of the diamond 4C. Due to the different shapes, quantity and arrangement methods, there are various forms, such as brilliant Step), mixed (mixed) ... and so on.
This diamond cutting and forming very many forms, but the most common form is the full-cut, usually referred to as (brilliat), with 58 pings, that is, the 33-third of the crown section Noodles, twenty -five face -to -face (including the bottom surface, if there is no face, the bottom is twenty -four sides), the most common shape is round, that is, the round brilliant.
In addition to the round and bright type, other various shapes or forms of cutting are referred to as fancy cut. Fancy cutting is just a general name. Round and bright changes: Marquise Brilliant, Pear Brilliant, Oval Brilliant, Heart Brilliant, etc. The square body of Emerald Cut: Including various square diamond shapes, such as horses, fish, butterflies, tennis rackets, cross, triangles, half -moon, portrait portraits, etc. .
The other two nouns are also commonly recorded in shape and cutting rals. n2. Modify cut: According to a certain type of principle, a slight change.
R n The light of the stars radiates outward. For example, the crown part is a bright type, the center is the desktop, and the surrounding is usually eight kites, eight star -shaped face, and sixteen waists around the face. ; The bottom is usually centered on the bottom tip, and each faces are radiated outward like light.
The so -called step cut, that is, emerald cut The class of class is arranged from the center to the center. The mixed -cutting grind is combined with a bright step -type cutting. The narrative method of the shape and cutting of the shape and the cutting Style. For example, the diamonds of the outer shape, if the crown and the bottom are bright, it is correctly described as a round brilliant cut; Write as a circular mixed cut.
. The size ()
The size of the diamonds is based on the size of the diamond Under the second decimal below CM. Since the measured part of each measurement may not be exactly the same, and there will be a small error with different gem measuring decks, if there are two different certificates in the same diamond, the size will be slightly slightly a little bit different. Different, there will be different results in the secondary measurement, but it is limited to not exceeding 0.02mm.
This diamonds are not pure round under the precision measurement of a tapestrite, so the minimum record and maximum diameter (Diameter) and full depth (the thickness of the entire diamond), the fancy diamond records its length, width width High, so there are three size numbers.
. Weight (weight)
is the second C of the diamond 4C. Each carat is equal to the two hundred luster (Milligram). Or it is calculated to 0.2 grams, so 1 gram is equal to 5 carats. As the diamond meter weighs until the second decimal decimal below, the third decimal must be separated or not. The second decimal is "points", which is equal to 100 points per carat.
The locust tree in the Middle East, the weight and size of the coats they knotted are quite consistent. The English name of this tree is Carob Tree, which is quite common in the local area. In ancient times, the pearl merchant first took the child to the pearl as the heavy unit of pearls, which was Carat, that is, Cera as the source of the heavy unit. Classes have generally used the weight of gemstones. At first, carat weights in various regions were slightly different. However, since the United States stipulated that each carat was equal to 200 mg in 1913, advanced countries have used this as a standard and no longer have higher highs.
. Four, full -deep percentage (depth%)
The cutting ratio of diamonds () mainly includes the following items, and the width of the waist (round diamond as the average width) is used as 1, or 100%write 100% Do the benchmark: (1) Full Deep percentage (DEPTH%), (2) desktop percentage (table%), (3) waist circumference thickness, (4) the bottom size (4) (5) polishing, or polishing, and 6) symmetry.

The full deep percentage of round diamonds is to divide the full depth (thickness) with the average number of the minimum and maximum diameter, and then turn into a percentage. In other words, it is the percentage of diamond thickness and diameter percentage Essence The whole deep percentage is calculated to the first place below the decimal point, and the second one is four.
For example: round diamond: diameter 6.50-6.59 thickness 3.83 → (6.50 6.59) /2=6.545=6.55 (four houses and five entry) 8.83/6.55 = 0.5847 = 58.5%= full depth percentage.
The fancy diamonds will be obtained by width (full deep) in width, regardless of its length.
, for example: fancy diamond: 13.18 width 8.24 height 5.45 → 5.45/8.24 = 0.6614 = 66.1%= full deep percentage.
The main purpose of the record of the full deep percentage is to understand the approximately thick situation of the diamond. The larger the percentage, the thicker the diamond, the smaller the smaller, the thinner. However, the full -depth diamond is affected by the size of the desktop, the height of the crown, the thickness of the waist circumference, and the depth of the bottom. big. The ideal crown angle should be 34 1/2 °, and the bottom depth should be 43.1%. However, according to the experience of actual observation, if the angle of the crown is within the range of 32 ° to 36 °, the bottom depth from 42.5%to 45.5%, diamonds can exert their glory. Location observation is for (to take it.
. The percentage of the desktop (table%)
The length of the maximum pair line of the round diamond desktop divides the average in diameter and fancy diamond width. For desktop percentage. The desktop percentage is calculated until the integer, and the decimals are four. For the desktop, the most obvious of the desktop size is the thickness of the crown. In addition to the thickness of the crown part, the size of the desktop is still affected by the thickness of the crown. For example, if the crown maintains a certain thickness, the larger the desktop when the angle of the crown part is, the smaller the desktop. In modern diamond cutting theory, the most controversial is the size of the desktop, so far there is no absolute standard. When the perspective of the crown section is ideal 34 1/2 °, the most common desktop is 58%to 65%, and the desktop that is too small or too large is not liked by ordinary people.
If according to the current suggestions of diamond -cutting grinding in the American Gem Academy, the desktop can be divided into the following four types according to its size:
Small desktop: 53% to 60%
medium -sized desktop: 61% To 64%
Large desktop: 65% to 70%
Super large desktop: 71% or more.
The effects of desktop size on bright, fire light, and appearance size:
The smaller desktop desktop is larger
The bright light is dense (less) than diffusion (feel more)
more fire light is more light. Less
The size of the appearance is larger

. The waist circumference (Girdle)

The waist fence on the diamond appraisal certificate includes the following two items:
(1) Girdle Thickness: The thickness of the essential position is divided into the following eight situations:
1. Extremely Thin extremely thin
2. . Thin thin
4. MEDIUM is moderate
5. Slightly Thick slightly thicker
6. Thick thick -still
7. Very Thick is thick
8. Extremely Thick r The thickness of N waist circumference is that its effect is convenient to inlaid and avoid diamonds from being too thin. The weak waist circumference, of course, is not as strong as those who resist the cracking. However, the waist circumference only needs some slight thickness, which is solid enough. The too thick waist circumference makes the diamond retain unrealistic weight. It also makes the diamond look stupid and the area becomes smaller. Essence
of course, the thickness of the waist circumference is the most ideal, but the finished product of the diamond is cut from the rough crystal of the diamond. The shape of the natural crystal is inevitable. There is often a phenomenon of unevenness. For example, if the waist circumference item of the appraisal book is recorded with THIN to Sl.thick (thin to extremely thick), it means that some of the waist circumference is thin, part is moderate, part is slightly thicker, the narrowest part is thin, the widest part is is Slightly thicker. The distribution of the thick part is not necessarily average, sometimes the thin and thick parts are small, and sometimes the thick parts are thinner.
The thick distribution is average and gradually becoming good. If the thickness suddenly becomes thinner, the waist circumference appears uneven and presents wavy shapes. This waist circumference should be regarded as one of the defects in symmetry. The more the thickness of the waist circumference, the more bad it is, the more bad it means. The wavy waist circumference indicates the inconsistent angle of the bottom face arrangement at the bottom, or there is a large natural rough or extra face under the waist circumference. The thickness of the GIA system to record the waist circumference is estimated with visual testing, and does not actually measure its percentage. Therefore, the thickness of the thickness is usually used in the above eight situations, and the percentage is not recorded.
(2) grinding:
Except for polishing or face -to -face waist circumference, the normal waist circumference should be translucent as white mist, and the surface is very smooth. If the edge is too careless or rapid, rough and rough, it becomes rough girdle.
The waist circumference that has been polished: Polished. Flurry waistline records are Faceted. The meticulous, polished, or fascinating waist circumference should be regarded as a good waist circumference. Only rough waist circumference should be regarded as one of the flaws on cutting, and the beauty of diamonds is slightly reduced.
If cracks on the waist circumference, bearded or feathered girl. Beard is usually not marked on the attachment, which is only recorded in the remarks column. According to the GIA system, if the waist circumference appears obviously cracking diamonds, its clarity level is included in the pure grade (FL) or internal pure grade (IF).

Seven. Culet
In the bright fifty -eight face, the sharp surface is also counted as one side. The size is divided into the following:
1. POINTED or NONE No
2. Very Small is small
3. Small small
4. MEDIUM BSP Moderate
5. Slightly large R n 7. Very Large is large
8. Extremely Large is large
The size on the bottom surface does not have a significant effect on the gloriousness and value of diamonds. Generally, the normal bottom surface should be small or moderate. Without the bottom surface, it is easy to make the tip to the tip. The too large bottom surface is rare. Although it is relatively unsightly, if it is grinded slightly at the bottom, it can be corrected only if it loses the tiny weight.
For the bottom bottom of the tip of the light, rough, or seemingly a small white dot, it is usually called rough, and the bottom bottom of the wear or break is called Abraded or Chipped. These two abnormal bottoms should be restarted, but it is not a serious defect.
eight, modifiers, polish, symmetry (symmetry)
This refers to the degree of polishing and delicateness on the surface of the diamond surface. The existence of Mark) or Burn Mark. Strictly speaking, the analysis of diamond symmetry should be divided into two categories: First, serious or major symmetry of the main (Major), and should be summarized within the scope of the ratio, and the narrative is described in the remarks column. The second is that the mild or minor (minor) symmetry refers to whether the shape and arrangement of the face are neat or appropriate. It should be listed as a modification range, only comprehensively judge its quality and disadvantages, recorded in the symmetrical bar.
The degree of advantages and disadvantages of lighting and symmetry, usually the following five levels are evaluation criteria:
excellent
very good
POOR is bad

In all gems, the most important thing about polishing and symmetry should belong to diamonds. Severe polishing or poor symmetry, only exceptions, is very rare. If you can find that fashion should be explained in the remarks bar. Whether the diamond cutting is not only judged by the advantages and disadvantages of polishing and symmetry in the "modification" column, and it is necessary to consider whether the cutting ratio and angle of the entire diamond is appropriate. In fact, the value of polishing and symmetry affects the value of diamonds is limited to a small percentage. Usually within a range of 1 to 2%, rarely reaches 3%, because poor polishing or symmetry can be corrected with re -polishing or slightly repaired, but the ratio or angle is not standard and it is difficult to modify it. If it is difficult to modify. To modify it, there are more weight loss, so it has a greater impact on the quality of diamond cutting.

. 9. Clarity grade
This is the third C of the diamond 4C. Ten times the fine surface features or internal content that cannot be noticed by the unknowingness of the clarity level, but it must be noted that the GIA system is a tool to use the two -eyed gem microscope to judge the clarity level. Finally Divopy the big mirror to review again.
It in all diamond appraisal projects, the most subjective should be the clarity level. Because the surface characteristics of no two diamonds or internal content are exactly the same. The experience of the appraiser must be judged and decided. Therefore, it is best to judge that the clarity level of the twelve people is best to be appointed by the experienced personnel with very rich experience, and avoid being rejected by one person. Essence For example, GTL is judged by the two to judge the clarity level.
The diamonds that meet pure conditions are very rare, so the general diamond transactions are based on the internal purity level as the highest clarity level (commonly known as the United States). The clarity is a characteristic description inside or outside the diamond. GIA does not encourage it to call it flawed, because the flaws have negative significance. Vvs levels are easily misunderstood because of the ultra -small internal content. For example, VS -level internal content does not affect the beauty and durability of diamonds.
Themial lectures
In judging the characteristics of the clarity level and looking at the characteristics, all the characteristics inside and outside the diamond need to be comprehensively considered, including: size, quantity, location, nature, color, and whether they emerge, followed It is the effect of diamond durability. After a ten -fold enlarged observation and finding the most obvious flaws, it is often possible to determine its clarity level. Other sporadic but not obvious small flaws rarely affect the judgment of its clarity level. Therefore, the most important thing to judge the level of clarity is the degree of visibility of the characteristics, not the number of quantities of the number of qualified certificates.
The tiny surface features (BLEMISHES, such as natural rough noodles, extra face, grinding wheel patterns, scratch patterns, wear marks, wounds, scars, etc.) grade. For this tiny surface characteristics, except for natural rough noodles and additional face -to -face GTLs are not marked on the inner map of the certificate, only recorded the minor details of the minor destail of Finish (Polish) Not Shown. The map shows that the work map of its internal operations is drawn in detail. However, some appraisers with lack of experience have mistaken these surface characteristics as internal contents, so that the internal pure level is misused into VVS1. In addition, the internal and external characteristics that can be seen only after more than ten times are zoomed in observation, and the internal and external characteristics of it should be ignored, and it is not required to be marked on the figure.

Ten, color grade

This is the fourth C of diamond 4C. Most of the color diamonds belong to the yellow series. Diamonds of other colors are relatively rare, and their colors are obvious when they are colorful diamonds. Therefore, diamonds are divided into grades, which are limited to yellow diamonds.
My all the hierarchical systems in the world, the most meticulous and practical applied to the actual application, the first -time color grading system created by the American Gem Academy (GIA). To this day, its system has become the most well -known diamond -colored standards in the world. Many countries or regions refer to this standard and adjust their own system, or directly quote the hierarchical name of this type of grading system.
Mocharial grading system for the American Gem Academy is represented by the use of English letters. It starts with D as the highest color level without A, B, and C. Each English alphabet represents the color range of each level, not a certain specific color position. Only standard diamonds at all levels must be located at the highest color position in this level. Diamonds sometimes still have subtle points.
DEF three levels are the same as color, regardless of the front and back observations, do not compare each other, they are colorless. At first glance at the front of GHIJ, it is also colorless. When the KLM third level is observed from the front, only large diamonds will see a slight pale yellow. Most people below level N will see their pale yellow tones, and even Z is the minimum color level. When the yellow concentration exceeds the Z level, it is colorful, and it is divided into three levels: Fancy Light Yellow (Fancy Yellow) and Fancy Intense Yellow. All kinds of color diamonds are also divided into three levels.
The division of color grade (GIA)
according to the GIA system, each English letter represents the scope of this class, not a specific location. Essence For example, the graded diamonds are higher than the standard -colored diamond E, which belongs to the D -level, higher than F is E -level, higher than G is F -class, and the remaining push: in other words, the G -grade between standard stone G and H, G -grade, in the standard stone G and H, the G -grade, the G -grade, the G -grade, the G -grade, the G -grade, the G -grade, the G -grade, and the Those who go to the standard stone H and i are H -level, and those between standard stone i and J are level i, and the remaining push.
The origin of the name of the name
The name of the color is compared to the gold content of gold. The less gold contains the magazine, the more gold content, the higher the color. Diamonds contain yellow, as much as the magazine contained in gold, the less yellow, the higher the color.
Che understanding of the classification classification
As early as the 1940s, the American Gem Institute invented the Color-Meter. The main reason for any diamond is that the various factors that affect the high and low are not completely clear. In addition, the diamond color is affected by factors such as the grinding ratio, fluorescent reaction, transparency, and mixed color. Therefore, the American Gem Institute still adopts real diamonds as a standard diamond. According to the discrimination of the form of color, it also predicts that the instrument is still far away if it wants to enter the universal practical stage.
The gemstone appraisal room around the world, if GIA is made as a diamond-colored standard, must have a set of standard diamonds (Master Color Dia-Monds or Master Diamonds), or It cannot be completely consistent with its system, resulting in a high or low phenomenon, and the standard is lost. In recent years, some people have used artificial CUBIC ZIRCONIA (referred to as CZ) instead of real diamonds for standard diamonds. It's like brown or gray diamonds. It is difficult to compare with yellow diamonds. (2) CZ's fire light (color astigmatism) is stronger than diamonds, which will affect the accuracy of judgment. (3) The stability of the CZ color is not good. After a period of time, the color level naturally changes. Therefore, the American Gem Institute refuses to identify CZ as a standard formation diamond.

Eleven, fluorescent reactions ()
The fluorescent reactions are the stimulation of diamonds being stimulated by external energy, which usually refers to the reaction color light that occurs when it is exposed to ultraviolet light. It is divided into (1) None according to its strength, (2) Faint is weak, (3) medium moderate, (4) strong, (5) Very Strong is very strong. Faint does not record its fluorescent reaction color.
one of the test projects in the diamond appraisal certificate is only one of the tested projects in the diamond appraisal certificate. For blue or yellow, the height of the diamond color is based on its own yellow light as the criterion, not based on the fluorescent reaction color.
The fluorescent reactions

The diamonds can emit fluorescence under ultraviolet light. The strength of the light is different, and most of the blue fluorescence. Figure (a) and Figure (b) are the same batch of diamonds. Figure (a) is the appearance of the fluorescent reactions that these diamonds occur under ultraviolet rays. The diamonds are Those who deliberately choose fluorescent reactions, not all diamonds have fluorescent reactions.
The light in the light and fluorescent light contains ultraviolet light, making diamonds with fluorescent reactions look particularly bright and beautiful. But among the diamonds with a strong fluorescent response, some diamonds will affect its transparency. Therefore, diamonds with a strong fluorescent response are not excellent.
. 12. Remarks
This remarks are to make up some diamond features that cannot be included in the above -mentioned column or do not need to be on the attachment. Gray or grain lines: unless the pulse patterns are color, reflective or white, they are usually not regarded as inside characteristics, and they are not described on the attachment. The pulse pattern is divided into (1) nil without it; (2) Slight is slight; (3) Moderate is easy to see; In the column. For example: Surface Graying is Not Shown (the surface of the surface is not displayed on the attachment). InternaL Grain Lines are not Shown
(2) The drawing is not described on the attached picture. For example: Minor Details of Polishes are not shown (the secondary details of the polishing are not displayed on the attachment). PINPOINTS are not shown (another needle point is not displayed on the attachment).
(3) The main ratio, angle or symmetry. For example: Crown Angles are greater than 35 degrees (height is greater than 35 degrees).

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