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https://www.americangemsociety.org/buying-diamonds-with-confidence/ags-diamond-grading-system/
The AGS 0–10 Diamond Grading System The AGS 0–10 grading scale is easy to understand: the highest possible grade is zero, and the lowest is 10.
https://www.withclarity.com/education/diamond-education/diamond-color
In the letter-grade diamond color scale, D (colorless) is the highest and best grade, and Z is the lowest. Diamond used to be graded like gemstones on a range that included AAA, AA, A, and B, so the new scale started at D to avoid confusion. This color chart shows how the color of a diamond changes visually across the scale.
https://www.igi.org/assets/images/pdf/4cs_chart.pdf
THE GLOBAL AUTHORITY IN DIAMOND, GEMSTONE AND JEWELRY GRADING www.igi.org I 1975 N T E R N A T I O N A L O G E M O L G I C A L I N S T I T U T E. Title: IGI 4c's 2019 - …
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.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.jewelrynotes.com/diamond-color-argyle-grading-scale-vs-gia-grading-scale/
Pink diamonds are graded on the Argyle scale using numbers from 1 to 9, and each number is followed by an abbreviation denoting the color variation of the stone. For example, the grade 5PP means that the stone is purplish pink and its color is graded 5, i.e., in the middle of the scale. See: Selection of eye-clean diamonds vetted for quality
https://www.gemsociety.org/jewelry-lapidary/grading-gemstones-and-diamonds/
Grading Gem Carvings. Gem carvings are judged on material, workmanship, and artistry. Learn how to apply these criteria to a piece with our step-by-step guide. Exposing Diamond Overgrading at EGL Labs. The effects of the 2014 scandal over diamond overgrading at EGL labs are still emerging.
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