Jewellery and Gems The Buying Guidebook: Diamond Grading Report

Today, few fine diamonds over one particular carat are sold without a diamond grading report, or certificate, as they will also be called, from a respected laboratory. Reports issued by the GIA/Gem trade laboratory are most widely used in the United States and many nations around world.
A grading review does more than clarify the stone’s genuineness, it fully describes the particular stone and evaluate each of the important factors affecting quality, beauty, plus value. Grading reports can be very useful for a variety of reasons. The information they consist of can provide verification of the “facts” because represented by the seller and allow one to make a safer decision when purchasing a diamond. Another, important function of reports is to verify the identity of a specific diamond at some future time, if, for example , it has been out of one’s possession for any cause. For insurance purposes, the information offered on the report will help ensure replacement of a lost or stolen diamond with one that is truly “compatible high quality. ”

Reports are not necessary for every single diamond, and many beautiful diamonds used in jewelry are sold without them. But when considering the purchase of a very good diamond weighting one carat or more, we strongly recommend that the diamond be accompanied by a report, even if it means possessing a diamond removed from its setting (no reputable lab will issue a report on a mounted diamond), and then reset. If you are considering a diamond that will lacks a report, it is easy for your jeweler to obtain one. Or, now that GIA is issuing diamond grading reports to the public, you may publish a diamond at GIA your self.

Do not rely on the report alone

The availability and widespread use of diamond grading reports can, when correctly understood, enable even those with out professional skills to make valid evaluations between several stones, and thus create more informed buying decisions. Reviews can be an important tool to help you realize differences affecting price. But we have to caution you not to let them interfere with what you like or really want. Remember, several diamonds are very beautiful even though indicate adhere to establish standards. In the final analysis, use your own eyes and enquire yourself how you like the stone.

A customer who was trying to decide between a number of diamonds. Her husband wanted to buy her the stone with the best report, but she preferred another stone which, according to what was around the reports, wasn’t as good. They determine against the best diamond and bought the one that made her happiest. The important thing is that they knew exactly what they were purchasing, and paid an appropriate price for that specific combination of quality factors. Basically, they made an informed choice. The reports gave them assurance regarding the facts, and greater confidence they knew what they were really comparing.

Improper use of reports can lead to pricey mistakes

As important s gemstone grading reports can be, they can become misused and lead to erroneous findings and costly mistakes. The key to being able to rely on a diamond review, and having confidence in your choice, lies in knowing how to read it correctly. For example , when trying to decide in between two diamonds accompanied by diamond grading reports, buyers all too often make a decision simply by comparing just two factors evaluated on the reports, color and clearness, and think they have made a sound decision. This is rarely the case. No one can make a sound decision based on color and clarity alone. In fact , whenever significant price differences exists among two stones of the same color and clarity as the more expensive stone, and often it is not the better value. Getting the same color and clarity is only part of the total picture. Differences in price indicates differences in quality, differences you might not see or understand. With circular diamonds, the information you need is in the report, but you need to understand what all the information means before you can make valid comparisons.

A word of caution: Never make a purchase relying solely on any kind of report without making sure the report matches the diamond, and that the particular diamond is still in the same condition described. Always seek a professional gemologist, gemologist-appraiser, or gem-testing laboratory to confirm that the stone accompanying report can be, in fact , the stone described presently there, and that the stone is still within the same condition indicated on the record. There are instances where a report has been accidentally sent with the wrong rock. And, in some cases, deliberate fraud is involved.

How to read a diamond grading report

Check the date released. It is very important to check the date within the report. It’s always possible that the gemstone has been damaged since the report has been issued. This sometimes occurs along with diamonds sold at auction. Since diamond jewelry can become chipped or cracked with wear, one must always check them. For instance , you might see a diamond accompanied by a record describing it as D – Flawless. If this stone were terribly chipped after the report was issued, however , the clarity grade could easily drop to VVS, and perhaps, much lower. Needless to say, in such a case value will be dramatically reduced.

Who issued the report? Check the name of the laboratory issuing the report. Is the review from a laboratory that is known plus respected? If not, the information on the statement may not be reliable. Several well-respected laboratories issue reports on diamonds. The best known in the United States include the Gemological Institute of America Gem Trade Lab (GIA/GTL or GIA), and the United states Gemological Laboratories (AGL). Respected European labs issuing reports include the Belgian Diamond High Council (HRD). Regardless of which report you are reading, all will provide similar information, including:

Identity of the stone. This verifies the fact that stone is a diamond. Some gemstone reports don’t make a specific declaration about identity because they are called gemstone reports and are only issued intended for genuine diamonds. If the report is not called a “diamond grading report” then there must be a statement attesting that it is genuine diamond.

Weight. The precise carat weight must be given.

Dimensions. Any diamond, of any form, should be measured and the dimensions documented as a means of identification, especially for insurance/identification purposes. The dimensions given on a diamond report are very prices and offer information that is important for several reasons. First, the dimensions can help you determine that the diamond being examined can be, in fact , the same diamond described in the report, since the likelihood of having two diamonds with exactly the same carat bodyweight and millimeter dimensions is remote control. Second, if the diamond has been damaged and re-cut since the report has been issued, the millimeter dimensions might provide a clue that something has been altered, which might affect the carat bodyweight as well. Any discrepancy between the dimensions that you or your jeweler get by measuring the stone, and those supplied on the report, should be a red flag to check the stone very carefully.

Finally, the particular dimensions on the report also inform you whether the stone is round or even out of round. Out of round diamond jewelry sell for less than those that are more flawlessly round.

Fine diamonds are “well-rounded”.

The diamond’s roundness will influence value, so it is determined very carefully from measurements of the stone’s diameter, gauged at several points around throughout the circumference. For a round diamond, the particular report will usually give two diameters, measured in millimeters and noted to the hundredth: for example , 6. fifty-one rather than 6. 5; or six. 07 rather than 6. 0. These indicate the highest and lowest size. Diamonds are very rarely perfectly circular, which is why most diamond reports may show two measurements. recognizing the particular rarity of truly round expensive diamonds, some deviation is permitted, as well as the stone will not be considered “out of round” unless it deviates simply by more than the established norm, approximately 0. 10 millimeter in an one particular carat stone. In an one carat diamond, if the difference is 0. 10 or less, then the stone is considered “round. ” If the distinction is greater, it is “out-of-round. ”

To calculate an acceptable deviation on a particular stone, average the high and the low diameter dimension given and multiply that number by 0. 0154. For example , if the dimensions given are 8. 20x 8. 31, the particular diameter average is 8. twenty five ( (8. 20 + 7. 31)/2). Multiply 8. 25 simply by 0. 0154 = 0. 127. This is the acceptable deviation allowable for this stone (between 0. 12 and 0. 13). The actual deviation in this example would be 0. 11 (8. 31 – 8. 20), nicely within the tolerance, so this diamond will be considered “round. ” Some flexibility is permitted on diamonds over two carats.

Depending on degree of out-of-roundness (how much it deviates through being perfectly round), price can be affected. The greater the deviation, the lower the price should be.

Dimensions for extravagant shapes

While dimension for fancy shapes diamonds are not as important as they are for round gemstones, there are length to width proportions that are considered “normal” and deviations may result in price reductions. These reflect acceptable ranges:

Pear form: 1 . 50: 1 to 1. seventy five: 1

Marquise shape: 1 . 75: 1 to 2. 25: 1

Emerald form: 1 . 50: 1 to 1. seventy five: 1

Oval shape: 1 . 50: 1 to 1. 75: 1

To higher understand what this means, let’s look at a marquise diamond as an example. If its report showed the length to be 15 millimeters and the width to be ten millimeters the length to width ratio would be 15 to 10 or 1 . 5: 1 . This would be acceptable. If, however , the dimensions were 30 mm long by ten mm wide, the ratio will be 30 to 10 or 3: 1 . This would be unacceptable; the percentage is too great, and the result is really a stone that looks much too really miss its width. Note: A long marquise is not necessarily bad, and some people prefer a longer shape, but it is essential to understand that such stones need to sell for less than those with normal measures. Always keep in mind the length to width percentage of fancy cuts, and adapt the price for that are not in the acceptable range.

Evaluating proportioning from the review

As discussed earlier, good proportioning is as critical to diamond since it is to the man or woman who wears this! If you’re ready to learn more info regarding diamond rings review our web-page.
The proportioning, especially the depth percentage and table percentage, ersus what determines how brilliance and fire the stone will have.

The data provided on diamond reports pertaining to proportions is critically important for circular, brilliant cut diamonds. Unfortunately, it is only of minimal use with elegant fancy shape diamonds. For fancies, you must learn to rely on your vision to tell whether or not the proportioning is suitable: are there differences in brilliance across the stone? Or flatness? Or dark areas such as “bow-ties” resulting from poor proportioning.

Evaluating the proportioning of a diamond is as critical as evaluating the color and clarity grades. Diamonds which are cut close to “ideal” proportions, gemstones with “excellent” makes can easily could prove costly than the norm while diamonds with poor makes sell for less; really badly proportioned stones should be costed for much less. The information on a diamond report can help you evaluate the proportioning plus know whether or not you should be paying more, or less, for a particular gemstone.

Depth percentage and Table percentage key to beauty

To determine whether or not a round stone’s proportioning, therefore critical to its beauty, excellent, look at the section of the report that will describes depth percentage and desk percentage. The depth percentage signifies the depth of the stone, the length from the table to the culet, as a percentage of the width of the stone. The table percentage represents the particular width of the table as a percent of the width of the entire stone. These numbers indicate how well a round stone has been cut in terms of its proportioning, and must adhere to very precise standards. Your own eye may be able to see differences in sparkle and brilliance, but you may not be capable to discern the subtleties of proportioning. The percentages on the report need to fall within a fairly specific range in order for the stone to be evaluated acceptable, excellent, or poor.

Some reports also provide information about the overhead angle. The crown angle tells you the angle at which the crown portion has been cut. This position will affect the depth and desk percentage. Normally, if the crown position is between 34 and thirty six degrees, the table and level will be excellent; between 32 plus 34, good; between 30 plus 32 degrees, fair; and lower than 30 degrees, poor. If the precise crown angle is given, it is probably considered acceptable. If not, there exists a statement indicating that crown angle surpasses 36 degrees, or is less than 30 degrees.

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