


| US Size | Circumference (mm) | Diameter (mm) |
|---|---|---|
| 5 | 49.3 | 15.7 |
| 5.5 | 50.6 | 16.1 |
| 6 | 51.9 | 16.5 |
| 6.5 | 53.1 | 16.9 |
| 7 | 54.4 | 17.3 |
| 7.5 | 55.7 | 17.7 |
| 8 | 57.0 | 18.1 |
| 8.5 | 58.3 | 18.5 |
| 9 | 59.5 | 18.9 |
| 9.5 | 60.8 | 19.4 |
| 10 | 62.1 | 19.8 |
| 10.5 | 63.4 | 20.2 |
| 11 | 64.6 | 20.6 |
| 11.5 | 65.9 | 21.0 |
| 12 | 67.2 | 21.4 |
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An extraordinary cabochon tanzanite of over eighteen carats, its vivid blue depth concentrated into a smooth, domed surface, is held in a two tone 18K gold crown setting with diamond accents. The cabochon cut reveals the tanzanite's color in its purest form, without facets to fragment the hue. The intricate gallery beneath the stone demonstrates meticulous attention to the ring's hidden architecture. One of a kind, and irreplaceable at this scale.
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