4ct Sapphire (Cushion, 8.88×8.88mm, Blue) vs 1.5ct Diamond (Round, 7.38×7.4mm, White)
Quick summary: When looked from above (face-up position), 4ct Sapphire (8.88×8.88mm, cushion cut) appears 65% larger than 1.5ct Diamond (7.38×7.4mm, round cut). See below how they compare side-by-side on a ring and finger.
| 4ct Sapphire (cushion cut) |
vs
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1.5ct Diamond (round cut) |
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blue |
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| 8.88×8.88 mm | 7.38×7.4 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
4ct Sapphire Cushion (8.88×8.88mm, Blue)
and
1.5ct Diamond Round (7.38×7.4mm, 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.
| 4 Ct Sapphire (Cushion) | 1.5 Ct Diamond (Round) | |
| 8.88×8.88 mm | vs | 7.38×7.4 mm |
| 70.97 mm² | 42.89 mm² |
| 4ct Sapphire Cushion (8.88×8.88mm) | |
| 1.5ct Diamond Round (7.38×7.4mm) | |
| Difference: 65% (28.08 mm²) |
4ct Sapphire (Cushion, 8.88×8.88mm) has approx. 65% more face-up area than 1.5ct Diamond (Round, 7.38×7.4mm).
Popular comparisons:
- 4ct Sapphire (Cushion, Blue, 8.88 x 8.88) vs. 4ct Diamond (Cushion, White, 9.25 x 9.25)
- 4ct Sapphire (Cushion, Blue, 8.88 x 8.88) vs. 2ct Diamond (Oval, White, 10.23 x 6.82)
- 4ct Sapphire (Cushion, Blue, 8.88 x 8.88) vs. 3.5ct Diamond (Cushion, White, 8.85 x 8.85)
- 4ct Sapphire (Cushion, Blue, 8.88 x 8.88) vs. 3ct Sapphire (Cushion, Blue, 8.06 x 8.06)
- 4ct Sapphire (Cushion, Blue, 8.88 x 8.88) vs. 4ct Sapphire (Oval, Blue, 12 x 8)
- 4ct Sapphire (Cushion, Blue, 8.88 x 8.88) vs. 4ct Sapphire (Round, Blue, 9.49 x 9.49)
- 4ct Sapphire (Cushion, Blue, 8.88 x 8.88) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 4ct Sapphire (Cushion, Blue, 8.88 x 8.88) vs. 3ct Diamond (Cushion, White, 8.4 x 8.4)