3ct Diamond (Round, 9.37×9.37mm, Black) vs 3ct Tourmaline (Round, 9.39×9.39mm, Yellow)
Quick summary: When looked from above (face-up position), 3ct Tourmaline (9.39×9.39mm, round cut) appears 0.4% larger than 3ct Diamond (9.37×9.37mm, round cut). See below how they compare side-by-side on a ring and finger.
| 3ct Diamond (round cut) |
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3ct Tourmaline (round cut) |
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| 9.37×9.37 mm | 9.39×9.39 mm | |
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Actual sizes of
3ct Diamond Round (9.37×9.37mm, Black)
and
3ct Tourmaline Round (9.39×9.39mm, Yellow)
as they would appear on a ring and finger.
Adjust the ring and finger size to get an idea of how these gemstones would look on your finger.
Where to buy?
For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile
Face-up Size
All things being equal, Diamond will face-up smaller than Tourmaline for a given
carat weight, because it has higher specific gravity
(3.52 vs. 3.1 - this means it's "heavier" compared to Tourmaline of the same size). Face-up size also depends heavily on the
proportions of the cut.
Face-up area is a measure of the size of the gem when viewed from above (as set in a ring). It tells you how big the gem is at the girdle plane.
Face-up area is a measure of the size of the gem when viewed from above (as set in a ring). It tells you how big the gem is at the girdle plane.
| 3 Ct Diamond (Round) | 3 Ct Tourmaline (Round) | |
| 9.37×9.37 mm | vs | 9.39×9.39 mm |
| 68.96 mm² | 69.25 mm² |
| 3ct Diamond Round (9.37×9.37mm) | |
| 3ct Tourmaline Round (9.39×9.39mm) | |
| Difference: 0.4% (0.29 mm²) |
3ct Tourmaline Round (9.39×9.39mm) has approx. 0.4% more face-up area than 3ct Diamond Round (9.37×9.37mm).
Popular comparisons:
- 3ct Diamond (Round, Black, 9.37 x 9.37) vs. 1.2ct Sapphire (Oval, Dark Purple, 8 x 6)
- 3ct Diamond (Round, Black, 9.37 x 9.37) vs. 3.06ct Sapphire (Trillion, White, 10.2 x 10.2)
- 3ct Diamond (Round, Black, 9.37 x 9.37) vs. 5.4ct Sapphire (Emerald, Light Yellow, 11.21 x 8.3)
- 3ct Diamond (Round, Black, 9.37 x 9.37) vs. 3.06ct Emerald (Trillion, Green, 11.63 x 11.63)
- 3ct Diamond (Round, Black, 9.37 x 9.37) vs. 1.9ct Diamond (Marquise, Dark Red, 12 x 6)
- 3ct Diamond (Round, Black, 9.37 x 9.37) vs. 1.2ct Sapphire (Oval, Blue, 8 x 6)
- 3ct Diamond (Round, Black, 9.37 x 9.37) vs. 1.2ct Sapphire (Emerald, Blue, 6.79 x 5.03)
- 3ct Diamond (Round, Black, 9.37 x 9.37) vs. 3.06ct Sapphire (Emerald, White, 9.27 x 6.87)
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Actual size is currently adjusted to screen.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a gem, ring and finger will not be shown correctly.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a gem, ring and finger will not be shown correctly.