Pre-selected for exceptional quality, the cut, color, and clarity of our loose diamonds are evaluated based on a standardized grading scale. Also, each loose diamond is accompanied by a grading report from either GIA, AGSL, or GemEx, independent diamond grading labs …
GIA has established the internationally accepted standard for diamond grading on which Costco's standards are based. Costco offers our members high quality jewelry at an exceptional value. Our team of GIA Graduate Gemologists inspect every diamond to ensure it meets Costco's strict quality standards. We only sell natural and untreated diamonds.
GIA Diamond Grading Report – From January 2006, GIA started to include the cut grading of round brilliants in their reports. This cut grade ( on a scale of excellent to poor) is assigned based on a combined assessment of the diamond's proportions, polish and symmetry. The full GIA diamond grading report with a clarity plot of inclusions.
The quality of a diamond's cut is widely considered the most important of the four Cs in determining the beauty of a diamond; indeed, it is commonly acknowledged that a well-cut diamond can appear to be of greater carat weight, and have clarity and color appear to be of better grade than they actually are.
Diamond professionals use the grading system developed by GIA in the 1950s, which established the use of four important factors to describe and classify diamonds: Clarity, Color, Cut, and Carat Weight. Diamonds can be fashioned into a variety of shapes and still be beautiful. These are known as the 4Cs.
The diamond may in fact be flawless to the naked eye, since no single inclusion is severe enough to be seen (even though the cumulative effect of the flaws might warrant a lower clarity grade). When in doubt, speak to a diamond consultant, who will gladly review a diamond on your behalf.
Grading Diamond Cut. GIA provides a diamond cut quality grade for standard round brilliant diamonds that fall into the D-to-Z color range. To develop their Cut Grading System, GIA performed extensive computer modeling of round brilliant diamonds over a 15-year period and conducted more than 70,000 observations on actual stones to validate the research.
Diamond clarity refers to the absence of these inclusions and blemishes. Diamonds without these birthmarks are rare, and rarity affects a diamond's value. Using the GIA International Diamond Grading System™, diamonds are assigned a clarity grade that ranges from flawless (FL) to diamonds with obvious inclusions (I 3). Every diamond is unique.
How GIA grades Diamond Cut Quality for Round diamonds. GIA diamond cutting grades for Round diamonds range from Excellent to Poor. Diamond cut grade is based on a number of factors including symmetry, polish, brilliance and fire. For the most brilliance and beauty, only consider Round Brilliant diamonds with an Excellent cut.
GIA created the 4Cs (Color, Clarity, Cut and Carat Weight) as a universal method for establishing the quality of any diamond, anywhere in the world. The 4Cs means two very important things: diamond quality can be communicated in a universal language, and diamond …
With the Hanneman diamond cut grading system, you can derive the cut grade of any round brilliant with minimal measurements and calculations.… Modern Diamond Cut Grading Methods The GIA modern diamond cut grading method is the most widely accepted in the industry.
Diamond clarity is a qualitative metric that grades the visual appearance of each diamond. The fewer inclusions and blemishes the diamond has, the better the clarity grade. While the clarity can significantly impact a diamond's value (it's one of the most important 4 Cs ), imperfections typically can't be recognized by the naked or ...
Therefore the GIA is still setting the standards for diamond grading since they teach people how to grade diamonds. Measuring Diamonds by GIA vs. AGS Standards: Keep in mind that the proportions of a diamond are determined by measuring the diamond using computerized proportions analysis.
A lower color diamond with a higher cut grade will have more sparkle and visual appeal than a higher color diamond with a lower cut grade. If, while shopping for a diamond, you are ever given a color range (e.g. G-H) as opposed to a specific grade, the diamond is not certified by GIA.
Using the GIA grading scale, the best diamond quality that you can get is a D color, Flawless clarity diamond with Excellent cut quality. In conjunction with these ratings, the symmetry and polish grades should both be Excellent as well.
2. AGS Certification. The AGS (American Gem Society) prides itself on being the original lab to provide diamond cut grades. Long before the GIA introduced their cut grade a few years ago, the AGS has been offering its unique cut grade scale from 0 to 9 (with 0 being termed "ideal").
The Federal Trade Commission (FTC) requires jewelers to truthfully and accurately represent the grading system used to determine a diamond's quality. You may have heard different views expressed in the news regarding various grading standards and their meanings. Diamond quality grading is central to the integrity of the jewelry and diamond …
During the day, and especially at night, 3M Diamond Grade DG³ Reflective Sheeting can make a difference by making signage brighter and more visible, giving drivers more time to react. Let's compare. High Intensity Prismatic Sheeting meets middle grade performance standards and ASTM D4956 Type IV. This reflective sheeting uses polycarbonate ...
Blue Nile offers four different cut grades Ideal: This rare cut represents roughly the top 3% of diamond cut quality.It reflects most of the light that enters the diamond. Very Good: This cut represents roughly the top 15% of diamond cut quality.It reflects nearly as much light as the ideal cut, but for a lower price.
The GIA Diamond Dossier® is a more concise, compact version of the GIA Diamond Grading Report and is available for diamonds that weigh between 0.15 and 1.99 carats. This report includes all the important 4Cs grading results as the Diamond Grading …
Tiffany Standard of Clarity. Tiffany's strict diamond grading standards are executed with expertise, integrity and accuracy. When Tiffany believes that a diamond's clarity is on the borderline between two grades, Tiffany will always assign the stone a lower grade—never falsely inflating a …
The gemological standards in this section refer only to individually registered engagement diamonds set in certain ring styles. Does Diamond Color Matter? Color is the second most important of the 4Cs because the color grade directly affects the stone's appearance.
Diamond Chart. By Robert Underhill. Below is a diamond chart with a rating system that will help you to evaluate stones of specific color and diamond clarity combinations. This diamond chart compares diamonds starting with the most prized color D, (colorless) …
In light of such results, the only possible position we can take to protect you, the consumer, is to always assume an HRD graded stone is, in GIA standards, two grades lower than is claimed by HRD. The HRD grade bias in relation to GIA is well known and established in the diamond industry and is clearly reflected in industry pricing.
The AGS Light Performance Cut Grade. In 2005, the American Gem Society introduced a Light Performance Cut Grade system based on ray tracing. A diamond's 3D scan is used to determine values for brightness, leakage, contrast, and dispersive potential. Those values determine the diamond's performance grade on a scale of 0 (best) to 10 (worst).
DIAMOND GRADING CHART. Every diamond certified by the GIA undergoes a thorough, independent evaluation. Here you will learn how GIA diamond grades are established, and how those grades affect the diamond's price. Each of the four C's (Carat Weight, Cut, Color, Clarity) is accompanied by a diamond chart illustrating the differences between grades.
These grades are the opinion of the individual at the lab who graded the diamond, based on the lab's own subjective grading standards. Certificates also include other information about the diamond's polish, symmetry and fluorescence, and also a graphical depiction of the diamond showing the location of the diamond's inclusions.
The system is characterized by the "diamond" that is actually a "square‐ on‐point" shape. It identifies the hazards of a material and the degree of severity of the health, flammability, and instability hazards. Hazard severity is indicated by a numerical rating that ranges from zero (0)
The GIA Diamond Dossier® is a more concise, compact version of the GIA Diamond Grading Report and is available for diamonds that weigh between 0.15 and 1.99 carats. This report includes all the important 4Cs grading results as the Diamond Grading Report, but does not include the plotted diagram.
These classes of diamond have different color grading standards. The standards described here are strictly for white diamonds. For fancy colored diamond standards, see this article for details. Today, the white diamond color grading system established …
