A diamond grading report will commonly include a plotted diagram of your diamond and significant characteristics, including the 4Cs (cut, color, clarity and carat weight). The report will also describe the diamond’s shape, exact measurements, proportions and depth percentages as well as grade the polish and symmetry. It should also comment on the characteristics like fluorescence, raining, and any imperfections in the diamond. Please note: a grading report does not include an appraisal or any kind of statement of monetary worth of the diamond. Grading reports simply state the scientific facts of your diamond that can be evaluated by highly standardized criteria.
It is important to refer to the certificates issued by GIA (gemological Institute of America) and AGS (American Gem Society) as Diamond Grading Reports. This is an important distinction, one that probably came years after GIA's lab started offering reports. However generally the diamond industry still uses the terms certificate and grading report interchangeably. The term certificate or cert for short. A Diamond Grading Report is a statement, issued by an independent Gemological Laboratory, that at the time of evaluation, the Diamond in question has been examined by experienced Diamond Graders, using various gemological instruments, and determined to contain the characteristics as stated in the Report.
Grading reports do not give a value; appraisals do that. They give an independent expert opinion on quality for loose or unset gems. Most grading institutes have labs or services worldwide and do not sell diamonds. Reading a certificate should be learnt carefully and is helpful in diamond purchase. However, purchasing a diamond should not be solely based on its certification. Some diamonds can look beautiful even if they don’t seem good from their certification.
Sometimes the diamond can get damaged before the certification date. Therefore it is important to ask the retailer to explain the similarity of the purchased diamond with that in the certification.
We do not sell silverplate or silvertone, all designs are made in fine quality real gold (10KT, 14KT or 18KT), platinum or 0.925 purity sterling silver. There is something to be noted about silver that is claimed to be used in jewelry by stores in general. We do not use peweter in our jewelry and we do not sell imitation or just fashion jewelry. Most of our Baltic amber jewelry is made with white shiny sterling silver. Silver - one of the world's most useful metals, is also one of the world's most valuable metals. It can achieve a great polish and does not tarnish in its pure form. Because pure silver is so soft, most silver jewelry is alloyed with other metals (alloys). This makes it more suitable for general jewelry use such as in handcrafted jewelry featuring weaving and other intricate designs. Our jewelry is made in 14K gold, platinum or pure sterling silver with certified diamonds and genuine gemstones.
The Identification Number is often laser inscribed on the diamond, if not, one can always request the jeweler for the same. IGI uses the terminology "Diamond Identification Report" although it is recognized as a certificate. Every lab has a certificate (or "report") number, which identifies a diamond uniquely. The Lab keeps an internal copy of everything shown on the certificate, and also additional information. The certificates can thus be re-issued when they are lost.
The Laboratory from where the certificate is issued should be well constituted and respectable.
The Diamond’s origins; whether natural or enhanced, should be verified from the report. Generally, fractured diamonds are not graded by labs, but laser drilled ones are accepted.
Carat weight of the diamond should be accurately written in the report. Diamonds are weighed to the thousandth of a carat with a digital measuring device. On the Report, the weight is rounded off to the hundredth of a carat.
These parameters are also mentioned in the report, and therefore should be verified. Shapes can be categorized as Round, Pear, Heart, Oval, etc. Cutting Styles can be categorized as Brilliant, Marquise, Emerald, Princess, Step and Mixed.
Accuracy in measurement is very important in identification of a diamond, as no two diamonds can have exactly the same dimensions and weight. This is generally measured in millimeters, typically to a hundredth of a millimeter.
A diamond cut in well planned proportions exhibits more brilliance and fire. Therefore it is as important as clarity or color grades. The proportions of the diamond can be the summed up as its depth, and its table .Both are expressed as percentage figures. Depth percent refers to the percentage depth of the Diamond, measured from the table to the culet, relative to the width of the stone.
Diamond buyers should know the 4Cs: cut, color, clarity, and carat weight.
Fluorescence refers to a diamonds reaction when exposed to long wave ultraviolet radiations. Too much fluorescence can make a Diamond less desirable.
A Plot is a graphical representation of the imperfections present in the Diamond. Every diamond has unique characteristics like fingerprints. By plotting its characteristics, and combining this with the physical measurements of a Diamond, a Lab can uniquely identify each stone. This plot is a guideline for the Grader in the event that a customer returns to the Lab and requests verification on his diamond purchase. Internal characteristics are plotted in red, and external characteristics are plotted in green.
Comments are used to describe characteristics which are not discussed elsewhere on the certificate, or to mention the items not plotted or shown. For example, "insignificant external details are not shown" is one of the common comments.