3ct Sapphire (Cabochon, 9.87×6.58mm, Blue) vs 3ct Diamond (Cushion, 8.4×8.4mm, White)
Quick summary: When looked from above (face-up position), 3ct Diamond (8.4×8.4mm, cushion cut) appears 19% larger than 3ct Sapphire (9.87×6.58mm, cabochon cut). See below how they compare side-by-side on a ring and finger.
| 3ct Sapphire (cabochon cut) |
vs
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3ct Diamond (cushion cut) |
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blue |
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| 9.87×6.58 mm | 8.4×8.4 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
3ct Sapphire Cabochon (9.87×6.58mm, Blue)
and
3ct Diamond Cushion (8.4×8.4mm, 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, Sapphire will face-up smaller than Diamond for a given
carat weight, because it has higher specific gravity
(4 vs. 3.52 - this means it's "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 Ct Sapphire (Cabochon) | 3 Ct Diamond (Cushion) | |
| 9.87×6.58 mm | vs | 8.4×8.4 mm |
| 53.25 mm² | 63.5 mm² |
| 3ct Sapphire Cabochon (9.87×6.58mm) | |
| 3ct Diamond Cushion (8.4×8.4mm) | |
| Difference: 19% (10.25 mm²) |
3ct Diamond (Cushion, 8.4×8.4mm) has approx. 19% more face-up area than 3ct Sapphire (Cabochon, 9.87×6.58mm).
Popular comparisons:
- 3ct Sapphire (Cabochon, Blue, 9.87 x 6.58) vs. 2.2ct Sapphire (Emerald, Blue, 8.3 x 6.15)
- 3ct Sapphire (Cabochon, Blue, 9.87 x 6.58) vs. 2.5ct Diamond (Cabochon, White, 9.69 x 6.46)
- 3ct Sapphire (Cabochon, Blue, 9.87 x 6.58) vs. 3ct Diamond (Cabochon, White, 10.31 x 6.87)
- 2ct Sapphire (Cabochon, Dark Blue, 8 x 6) vs. 2.27ct Sapphire (Cabochon, Light Blue, 8 x 6.1)
- 2ct Sapphire (Cabochon, Blue, 8.63 x 5.75) vs. 2ct Diamond (Cabochon, White, 9 x 6)
- 2ct Sapphire (Cabochon, Blue, 8.63 x 5.75) vs. 2ct Ruby (Oval, Red, 9.53 x 6.35)
- 5ct Sapphire (Cabochon, Dark Blue, 10 x 10) vs. 8ct Ruby (Cabochon, Red, 13.68 x 9.12)
- 3.9ct Sapphire (Cabochon, Blue, 9.5 x 7.8) vs. 2.94ct Sapphire (Cabochon, Purple, 8.25 x 6.98)