3.7ct Spinel (Round, 9.58×9.58mm, Red) vs 1ct Diamond (Round, 6.5×6.5mm, White)
Quick summary: When looked from above (face-up position), 3.7ct Spinel (9.58×9.58mm, round cut) appears 2.2 times larger than 1ct Diamond (6.5×6.5mm, round cut). See below how they compare side-by-side on a ring and finger.
| 3.7ct Spinel (round cut) |
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1ct Diamond (round cut) |
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red |
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| 9.58×9.58 mm | 6.5×6.5 mm | |
| actual size | ||
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Actual size is set for screen
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Ring:
Skin tone:
Ring width: 3.0 mm
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64 mm |
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Actual sizes of
3.7ct Spinel Round (9.58×9.58mm, Red)
and
1ct Diamond Round (6.5×6.5mm, White)
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, Spinel will face-up slightly smaller than Diamond for a given
carat weight, because it has higher specific gravity
(3.6 vs. 3.52 - this means it's "slightly heavier" compared to Diamond 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.
| 3.7 Ct Spinel (Round) | 1 Ct Diamond (Round) | |
| 9.58×9.58 mm | vs | 6.5×6.5 mm |
| 72.08 mm² | 33.18 mm² |
| 3.7ct Spinel Round (9.58×9.58mm) | |
| 1ct Diamond Round (6.5×6.5mm) | |
| Difference: 117% (38.9 mm²) |
3.7ct Spinel (Round, 9.58×9.58mm) has approx. 117% more face-up area than 1ct Diamond (Round, 6.5×6.5mm). In other words, it's 2.17x larger.
Popular comparisons:
- 3.7ct Spinel (Round, Red, 9.58 x 9.58) vs. 0.67ct Diamond (Round, White, 5.69 x 5.69)
- 3.7ct Spinel (Round, Red, 9.58 x 9.58) vs. 0.4ct Diamond (Round, White, 4.79 x 4.79)
- 1ct Spinel (Round, Red, 6.19 x 6.19) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 1.35ct Spinel (Round, Red, 6.84 x 6.84) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 5ct Spinel (Round, Red, 10.59 x 10.59) vs. 5ct Alexandrite (Round, Light Green , 10.49 x 10.49)
- 1ct Spinel (Round, Red, 6.19 x 6.19) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 0.4ct Spinel (Round, Red, 4.56 x 4.56) vs. 0.07ct Diamond (Round, White, 2.68 x 2.68)
- 2ct Spinel (Round, Light Orange, 7.5 x 7.5) vs. 2ct Spinel (Round, Light Orange, 7 x 7)
Use the simulator on this page to play around with different ring and finger configurations.