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https://www.americangemsociety.org/ags-laboratories/jewelry-industry/jewelry-grading-report-details/
The AGS Laboratories’ newest grading service, the Jewelry Grading Report, offers a grading analysis of diamonds that are already set in jewelry. This opportunity allows consumers ranging from buyers of everyday wear jewelry to collectors of designer diamonds the access to AGSL grades supported by our ethical reputation and high standards.
https://www.gemsociety.org/jewelry-lapidary/grading-gemstones-and-diamonds/
Carats and Gemstone Grading Carats are the units used to measure gem weight and one of the main factors in gem grading. Learn what affects the price per carat of various gem species.… Blue Tourmaline (Indicolite) Buying Guide
https://www.americangemsociety.org/buying-diamonds-with-confidence/ags-diamond-grading-system/
So, a diamond with a color grade of 3 has less color than a diamond with a color grade of 5. Natural diamonds having less color are rarer; therefore, they may cost more. When writing the grades of a diamond using the AGS Scale, diamond Cut grade is first, then diamond Color, Clarity, then Carat Weight—in that order.
https://www.jewelrythis.com/faq/grading/
Jewelry Glossary Grading The standard system used for grading the quality of diamonds was developed by the Gemological Institute of America and is based on the f our Cs (4Cs) method that looks at color, cut, clarity and carat weight.
https://www.jewelryexchange.com/gradingInfo-sp
Important Information About Diamond Grading The Jewelry Exchange sends diamonds to three different gemological research laboratories for grading: GIA, EGL USA, and AGS. Each lab has its own grading standards, so when comparing diamonds, we recommended that you compare diamonds with like certificates. Gemological Institute of America
https://www.gemsociety.org/article/a-consumers-guide-to-gem-grading/
The “Four Cs” of gem grading stand for color, clarity, cut, and carat (weight). Gemologists grade gemstones based on these properties. I’ll explain how we gemologists evaluate each of these properties and how consumers can use this information. However, first you must understand that gemstones are graded by the rarity of their features.
https://www.firemountaingems.com/Resources/encyclobeadia/charts/E893
There are a lot of steps to grade a gemstone. Each step of grading focuses on a different feature and has many details that create the overall grade determination. It can be difficult to understand gemstone grades without training, so with the help of the Fire Mountain Gems and Beads gemologists we've created a chart to help clarify the basics.
https://www.worthy.com/appraisal/jewelry
Feb 12, 2020 · While jewelry appraisal is the process of assigning monetary value to a piece of jewelry for a specific purpose, diamond jewelry grading is the thorough evaluation of the jewel’s stone and its attributes: carat, cut, color and clarity. Gradings are carried out in renowned gemological laboratories like GIA and IGI by certified professionals.
https://www.champaignjewelers.com/about-us
Custum Jewelry Design, Jewelry repair and Appraisal services are also available. Owner Kari Johnson Smith is a Graduate Gemologist (G.G.) through the Gemological Institute of America (GIA). The requirements of a G.G. degree include diamond identification and grading, color gem identification and grading, and pearl grading.
https://mix945.com/experts-online/champaign-jewelers/
Costume Jewelry Design, Jewelry repair and Appraisal services are also available. Owner, Kari Johnson Smith, is a Graduate Gemologist (G.G.) through the Gemological Institute of America (GIA). The requirements of a G.G. degree include diamond identification and grading, color gem identification and grading and pearl grading.
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