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Authenticity & Gemology Guides
Diamond Grading & Ring Size Charts
Comprehensive grading scales for diamond color, clarity, and international ring size conversions.
Color Chart
GIA Diamond Color Scale evaluating body color from D (colorless) to Z (light color).
| Grade | Description | GIA Equivalent |
|---|---|---|
| D | Exceptionally White + | Exceptionally White + |
| E | Exceptionally White | Exceptionally White |
| F | Rare White + | Rare White + |
| G | Rare White | Rare White |
| H | White | White |
| I | Slightly Tinted White | Slightly Tinted White |
| J | Slightly Tinted White | Top Commercial |
| K | Tinted White | Top Commercial |
| L | Tinted White | Top Silver |
| M to N | Tinted Color | Silver Cape |
| O to R | Tinted Color | Cape |
| S to Z | Tinted Color | Dark Cape |
Clarity Chart
GIA Diamond Clarity Scale detailing internal characteristics and inclusions under 10x magnification.
| Grade | Full Name | Explanation & Inclusions |
|---|---|---|
| FL | Flawless | Free from inclusions and blemishes under 10x magnification |
| IF | Internally Flawless | Free from inclusions under 10x magnification |
| VVS1 / VVS2 | Very, Very Slightly Included | Minute inclusions that are extremely difficult for an experienced grader to see under 10x magnification |
| VS1 / VS2 | Very Slightly Included | Minor inclusions that are difficult to see under 10x magnification |
| SI1 / SI2 | Slightly Included | Noticeable inclusions that are easy or very easy to see under 10x magnification |
| I1 / I2 / I3 | Included | Inclusions that are obvious under 10x magnification and may affect transparency and brilliance |
Ring Size Conversion Chart
International ring size equivalent scale across English (UK), Metric (mm), American (US), and French/Japanese sizing.
| English (UK) | Metric (mm) | American (US) | French / Japanese |
|---|---|---|---|
| A | 37.8 mm | 1 | - |
| A 1/2 | 38.5 mm | 1 1/4 | - |
| B | 39.1 mm | 1 1/2 | - |
| B 1/2 | 39.8 mm | 1 3/4 | - |
| C | 40.4 mm | 2 | - |
| C 1/2 | 41.0 mm | 2 1/4 | - |
| D | 41.7 mm | 2 1/2 | 3 |
| D 1/2 | 42.3 mm | 2 3/4 | 3 |
| E | 42.9 mm | 3 | 4 |
| E 1/2 | 43.6 mm | 3 1/4 | 4 |
| F | 44.2 mm | 3 1/2 | 5 |
| F 1/2 | 44.8 mm | 3 3/4 | 5 |
| G | 45.5 mm | 4 | 6 |
| G 1/2 | 46.1 mm | 4 1/4 | 6 |
| H | 46.8 mm | 4 1/2 | 7 |
| H 1/2 | 47.4 mm | 4 3/4 | 7 |
| I | 48.0 mm | 5 | 8 |
| I 1/2 | 48.7 mm | 5 1/4 | 8 |
| J | 49.3 mm | 5 1/2 | 9 |
| J 1/2 | 50.0 mm | 5 3/4 | 9 |
| K | 50.6 mm | 6 | 10 |
| K 1/2 | 51.2 mm | 6 1/4 | 10 |
| L | 51.9 mm | 6 1/2 | 11 |
| L 1/2 | 52.5 mm | 6 3/4 | 11 |
| M | 53.1 mm | 7 | 12 |
| M 1/2 | 53.8 mm | 7 1/4 | 12 |
| N | 54.4 mm | 7 1/2 | 13 |
| N 1/2 | 55.1 mm | 7 3/4 | 13 |
| O | 55.7 mm | 8 | 14 |
| O 1/2 | 56.3 mm | 8 1/4 | 14 |
| P | 57.0 mm | 8 1/2 | 15 |
| P 1/2 | 57.6 mm | 8 3/4 | 15 |
| Q | 58.3 mm | 9 | 16 |
| Q 1/2 | 58.9 mm | 9 1/4 | 16 |
| R | 59.5 mm | 9 1/2 | 17 |
| R 1/2 | 60.2 mm | 9 3/4 | 17 |
| S | 60.8 mm | 10 | 18 |
| S 1/2 | 61.5 mm | 10 1/4 | 18 |
| T | 62.1 mm | 10 1/2 | 19 |
| T 1/2 | 62.7 mm | 10 3/4 | 19 |
| U | 63.4 mm | 11 | 20 |
| U 1/2 | 64.0 mm | 11 1/4 | 20 |
| V | 64.7 mm | 11 1/2 | 21 |
| V 1/2 | 65.3 mm | 11 3/4 | 21 |
| W | 65.9 mm | 12 | 22 |
| W 1/2 | 66.6 mm | 12 1/4 | 22 |
| X | 67.2 mm | 12 1/2 | 23 |
| X 1/2 | 67.8 mm | 12 3/4 | 23 |
| Y | 68.5 mm | 13 | 24 |
| Y 1/2 | 69.1 mm | 13 1/4 | 24 |
| Z | 69.7 mm | 13 1/2 | 25 |