1.8ct Sapphire (Cushion, 6.8×6.8mm, Blue) vs 1.47ct Diamond (Round, 6.73×6.76mm, White)
Quick summary: When looked from above (face-up position), 1.8ct Sapphire (6.8×6.8mm, cushion cut) appears 16% larger than 1.47ct Diamond (6.73×6.76mm, round cut). See below how they compare side-by-side on a ring and finger.
| 1.8ct Sapphire (cushion cut) |
vs
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1.47ct Diamond (round cut) |
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blue |
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| 6.8×6.8 mm | 6.73×6.76 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
1.8ct Sapphire Cushion (6.8×6.8mm, Blue)
and
1.47ct Diamond Round (6.73×6.76mm, 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.
| 1.8 Ct Sapphire (Cushion) | 1.47 Ct Diamond (Round) | |
| 6.8×6.8 mm | vs | 6.73×6.76 mm |
| 41.62 mm² | 35.73 mm² |
| 1.8ct Sapphire Cushion (6.8×6.8mm) | |
| 1.47ct Diamond Round (6.73×6.76mm) | |
| Difference: 16% (5.89 mm²) |
1.8ct Sapphire (Cushion, 6.8×6.8mm) has approx. 16% more face-up area than 1.47ct Diamond (Round, 6.73×6.76mm).
Popular comparisons:
- 1.8ct Sapphire (Cushion, Blue, 6.8 x 6.8) vs. 6.55ct Sapphire (Round, Blue, 11.19 x 11.19)
- 1.8ct Sapphire (Cushion, Blue, 6.8 x 6.8) vs. 1.6ct Diamond (Cushion, White, 6.81 x 6.81)
- 1.8ct Sapphire (Cushion, Blue, 6.8 x 6.8) vs. 1ct Diamond (Oval, White, 8.12 x 5.41)
- 1.8ct Sapphire (Cushion, Blue, 6.8 x 6.8) vs. 2ct Diamond (Round, White, 8.19 x 8.19)
- 1.8ct Sapphire (Cushion, Blue, 6.8 x 6.8) vs. 1.88ct Diamond (Round, White, 7.91 x 7.55)
- 1.8ct Sapphire (Cushion, Blue, 6.8 x 6.8) vs. 1.61ct Diamond (Round, White, 7.46 x 7.48)
- 1.8ct Sapphire (Cushion, Blue, 6.8 x 6.8) vs. 2ct Diamond (Cushion, White, 7.34 x 7.34)
- 1.8ct Sapphire (Cushion, Blue, 6.8 x 6.8) vs. 1.7ct Diamond (Round, White, 7.55 x 7.41)