18ct Diamond (Cushion, 15.27×15.27mm, White) vs 16ct Sapphire (Cushion, 14.09×14.09mm, White)
Quick summary: When looked from above (face-up position), 18ct Diamond (15.27×15.27mm, cushion cut) appears 17% larger than 16ct Sapphire (14.09×14.09mm, cushion cut). See below how they compare side-by-side on a ring and finger.
| 18ct Diamond (cushion cut) |
vs
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16ct Sapphire (cushion cut) |
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white |
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| 15.27×15.27 mm | 14.09×14.09 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
18ct Diamond Cushion (15.27×15.27mm, White)
and
16ct Sapphire Cushion (14.09×14.09mm, 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.
| 18 Ct Diamond (Cushion) | 16 Ct Sapphire (Cushion) | |
| 15.27×15.27 mm | vs | 14.09×14.09 mm |
| 209.86 mm² | 178.68 mm² |
| 18ct Diamond Cushion (15.27×15.27mm) | |
| 16ct Sapphire Cushion (14.09×14.09mm) | |
| Difference: 17% (31.18 mm²) |
18ct Diamond (Cushion, 15.27×15.27mm) has approx. 17% more face-up area than 16ct Sapphire (Cushion, 14.09×14.09mm).
Popular comparisons:
- 2ct Diamond (Cushion, White, 7.34 x 7.34) vs. 2ct Diamond (Round, White, 8.19 x 8.19)
- 1ct Diamond (Cushion, White, 5.8 x 5.8) vs. 1.03ct Diamond (Round, White, 6.56 x 6.56)
- 1.56ct Diamond (Cushion, White, 6.27 x 6.27) vs. 1.66ct Diamond (Cushion, White, 6.49 x 6.47)
- 1ct Diamond (Cushion, White, 5.83 x 5.83) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 0.25ct Diamond (Cushion, White, 3.7 x 3.7) vs. 0.3ct Diamond (Cushion, White, 3.9 x 3.9)
- 22ct Diamond (Cushion, White, 16.33 x 16.33) vs. 22ct Diamond (Round, White, 18.21 x 18.21)
- 0.5ct Diamond (Cushion, White, 4.62 x 4.62) vs. 0.5ct Diamond (Princess, White, 4.37 x 4.37)
- 2.4ct Diamond (Cushion, White, 8.43 x 7.4) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)