Diamond Glossary

Every diamond grade, shape, lab, and origin type defined with FAQs and dated references to aggregate Carat Hunter market data.

59 diamond terms across 6 categories, updated alongside weekly market data.
Carat Hunter Research · 2026-04-23

Clarity grades

FL (Flawless)IF (Internally Flawless)VVS1 (Very Very Slightly Included 1)VVS2 (Very Very Slightly Included 2)VS1 (Very Slightly Included 1)VS2 (Very Slightly Included 2)SI1 (Slightly Included 1)SI2 (Slightly Included 2)SI3 (Slightly Included 3, EGL only)I1 (Included 1)I2 (Included 2)I3 (Included 3)

Colour grades

D (Colourless)E (Colourless)F (Colourless)G (Near Colourless)H (Near Colourless)I (Near Colourless)J (Near Colourless)K (Faint)L (Faint)M (Faint)N (Very Light)O (Very Light)P (Very Light)Q (Very Light)R (Very Light)S (Light)T (Light)U (Light)V (Light)W (Light)X (Light)Y (Light)Z (Light)

Cut grades

Ideal (Cut)Excellent (Cut)Very Good (Cut)Good (Cut)Fair (Cut)Poor (Cut)

Shapes

Round Princess Oval Cushion Emerald Pear Marquise Radiant Asscher Heart

Grading laboratories

GIA IGI AGS GCAL HRD EGL

Origin

Natural Diamond Lab-Grown Diamond

Looking to compare actual diamonds? Browse Carat Hunter's catalog at advanced search.

Updated 2026-04-23. Source: Carat Hunter Research.