2.78ct Sapphire (Round, 7.8×7.8mm, Blue) vs 1ct Diamond (Round, 6.42×6.42mm, White)
Quick summary: When looked from above (face-up position), 2.78ct Sapphire (7.8×7.8mm, round cut) appears 48% larger than 1ct Diamond (6.42×6.42mm, round cut). See below how they compare side-by-side on a ring and finger.
| 2.78ct Sapphire (round cut) |
vs
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1ct Diamond (round cut) |
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blue |
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| 7.8×7.8 mm | 6.42×6.42 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
2.78ct Sapphire Round (7.8×7.8mm, Blue)
and
1ct Diamond Round (6.42×6.42mm, 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.
| 2.78 Ct Sapphire (Round) | 1 Ct Diamond (Round) | |
| 7.8×7.8 mm | vs | 6.42×6.42 mm |
| 47.78 mm² | 32.37 mm² |
| 2.78ct Sapphire Round (7.8×7.8mm) | |
| 1ct Diamond Round (6.42×6.42mm) | |
| Difference: 48% (15.41 mm²) |
2.78ct Sapphire (Round, 7.8×7.8mm) has approx. 48% more face-up area than 1ct Diamond (Round, 6.42×6.42mm).
Popular comparisons:
- 2.78ct Sapphire (Round, Blue, 7.8 x 7.8) vs. 2.03ct Sapphire (Oval, Blue, 8.41 x 6.73)
- 2.78ct Sapphire (Round, Blue, 7.8 x 7.8) vs. 1ct Diamond (Round, White, 6.25 x 6.25)
- 2.78ct Sapphire (Round, Blue, 7.8 x 7.8) vs. 3.48ct Sapphire (Round, Blue, 8.53 x 8.53)
- 1ct Sapphire (Round, Blue, 5.98 x 5.98) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 2ct Sapphire (Round, Blue, 7.53 x 7.53) vs. 2ct Diamond (Round, White, 8.19 x 8.19)
- 1ct Sapphire (Round, Blue, 6.5 x 6.5) vs. 1ct Sapphire (Cushion, Blue, 6 x 6)
- 5.55ct Sapphire (Round, Blue, 10.58 x 10.58) vs. 9ct Sapphire (Cushion, Blue, 11.63 x 11.63)
- 1ct Sapphire (Round, Blue, 5.98 x 5.98) vs. 1ct Diamond (Round, White, 6.5 x 6.5)