2.5ct Sapphire (Cushion, 7.59×7.59mm, Blue) vs 4ct Diamond (Cushion, 9.25×9.25mm, White)
Quick summary: When looked from above (face-up position), 4ct Diamond (9.25×9.25mm, cushion cut) appears 49% larger than 2.5ct Sapphire (7.59×7.59mm, cushion cut). See below how they compare side-by-side on a ring and finger.
| 2.5ct Sapphire (cushion cut) |
vs
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4ct Diamond (cushion cut) |
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blue |
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| 7.59×7.59 mm | 9.25×9.25 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
2.5ct Sapphire Cushion (7.59×7.59mm, Blue)
and
4ct Diamond Cushion (9.25×9.25mm, 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.
| 2.5 Ct Sapphire (Cushion) | 4 Ct Diamond (Cushion) | |
| 7.59×7.59 mm | vs | 9.25×9.25 mm |
| 51.85 mm² | 77.01 mm² |
| 2.5ct Sapphire Cushion (7.59×7.59mm) | |
| 4ct Diamond Cushion (9.25×9.25mm) | |
| Difference: 49% (25.16 mm²) |
4ct Diamond (Cushion, 9.25×9.25mm) has approx. 49% more face-up area than 2.5ct Sapphire (Cushion, 7.59×7.59mm).
Popular comparisons:
- 2.5ct Sapphire (Cushion, Blue, 7.59 x 7.59) vs. 2.5ct Diamond (Cushion, White, 7.91 x 7.91)
- 2.5ct Sapphire (Cushion, Blue, 7.59 x 7.59) vs. 1.3ct Diamond (Emerald, White, 7.29 x 5.4)
- 2.5ct Sapphire (Cushion, Blue, 7.59 x 7.59) vs. 2ct Diamond (Cushion, White, 7.34 x 7.34)
- 2.5ct Sapphire (Cushion, Blue, 7.59 x 7.59) vs. 5.14ct Sapphire (Cushion, Blue, 9.65 x 9.65)
- 2.5ct Sapphire (Cushion, Blue, 7.59 x 7.59) vs. 1.5ct Diamond (Round, White, 7.44 x 7.44)
- 2.5ct Sapphire (Cushion, Blue, 7.59 x 7.59) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 2.5ct Sapphire (Cushion, Blue, 7.59 x 7.59) vs. 3ct Diamond (Cushion, Dark Blue, 9 x 7)
- 2.5ct Sapphire (Cushion, Blue, 7.59 x 7.59) vs. 2ct Diamond (Round, White, 8.19 x 8.19)