4ct Sapphire (Cushion, 8.79×8.79mm, Blue) vs 3ct Diamond (Asscher, 8.1×8.1mm, White)
Quick summary: When looked from above (face-up position), 4ct Sapphire (8.79×8.79mm, cushion cut) appears 15% larger than 3ct Diamond (8.1×8.1mm, asscher cut). See below how they compare side-by-side on a ring and finger.
| 4ct Sapphire (cushion cut) |
vs
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3ct Diamond (asscher cut) |
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blue |
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| 8.79×8.79 mm | 8.1×8.1 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 (8.79×8.79mm, Blue)
and
3ct Diamond Asscher (8.1×8.1mm, 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) | 3 Ct Diamond (Asscher) | |
| 8.79×8.79 mm | vs | 8.1×8.1 mm |
| 69.54 mm² | 60.36 mm² |
| 4ct Sapphire Cushion (8.79×8.79mm) | |
| 3ct Diamond Asscher (8.1×8.1mm) | |
| Difference: 15% (9.18 mm²) |
4ct Sapphire (Cushion, 8.79×8.79mm) has approx. 15% more face-up area than 3ct Diamond (Asscher, 8.1×8.1mm).
Popular comparisons:
- 4ct Sapphire (Cushion, Blue, 8.79 x 8.79) vs. 0.7ct Emerald (Cushion, Green, 5.59 x 5.59)
- 4ct Sapphire (Cushion, Blue, 8.79 x 8.79) vs. 3ct Diamond (Emerald, White, 9.64 x 7.14)
- 4ct Sapphire (Cushion, Blue, 8.79 x 8.79) vs. 3ct Diamond (Princess, White, 7.95 x 7.95)
- 4ct Sapphire (Cushion, Blue, 8.79 x 8.79) vs. 5ct Diamond (Princess, White, 9.42 x 9.42)
- 4ct Sapphire (Cushion, Blue, 8.79 x 8.79) vs. 4ct Diamond (Princess, White, 8.75 x 8.75)
- 12ct Sapphire (Cushion, Blue, 12.8 x 12.8) vs. 2ct Ruby (Cushion, Red, 7.04 x 7.04)
- 3.59ct Sapphire (Cushion, Blue, 8.2 x 8.3) vs. 6.22ct Emerald (Emerald, Green, 12.4 x 10.9)
- 2ct Sapphire (Cushion, Blue, 7.04 x 7.04) vs. 2ct Diamond (Cushion, White, 7.34 x 7.34)