6ct Sapphire (Cushion, 10.16×10.16mm, Blue) vs 4ct Diamond (Cushion, 9.25×9.25mm, White)
Quick summary: When looked from above (face-up position), 6ct Sapphire (10.16×10.16mm, cushion cut) appears 21% larger than 4ct Diamond (9.25×9.25mm, cushion cut). See below how they compare side-by-side on a ring and finger.
| 6ct Sapphire (cushion cut) |
vs
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4ct Diamond (cushion cut) |
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blue |
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| 10.16×10.16 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
6ct Sapphire Cushion (10.16×10.16mm, 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.
| 6 Ct Sapphire (Cushion) | 4 Ct Diamond (Cushion) | |
| 10.16×10.16 mm | vs | 9.25×9.25 mm |
| 92.9 mm² | 77.01 mm² |
| 6ct Sapphire Cushion (10.16×10.16mm) | |
| 4ct Diamond Cushion (9.25×9.25mm) | |
| Difference: 21% (15.89 mm²) |
6ct Sapphire (Cushion, 10.16×10.16mm) has approx. 21% more face-up area than 4ct Diamond (Cushion, 9.25×9.25mm).
Popular comparisons:
- 6ct Sapphire (Cushion, Blue, 10.16 x 10.16) vs. 6ct Sapphire (Round, Blue, 10.86 x 10.86)
- 6ct Sapphire (Cushion, Blue, 10.16 x 10.16) vs. 7ct Sapphire (Cushion, Blue, 10.7 x 10.7)
- 6ct Sapphire (Cushion, Blue, 10.16 x 10.16) vs. 6ct Emerald (Cushion, Green, 11.58 x 11.58)
- 6ct Sapphire (Cushion, Blue, 10.16 x 10.16) vs. 6ct Sapphire (Pear, Blue, 15.09 x 9.09)
- 6ct Sapphire (Cushion, Blue, 10.16 x 10.16) vs. 6ct Sapphire (Oval, Blue, 13.74 x 9.16)
- 6ct Sapphire (Cushion, Blue, 10.16 x 10.16) vs. 5ct Emerald (Cushion, Green, 10.9 x 10.9)
- 6ct Sapphire (Cushion, Blue, 10.16 x 10.16) vs. 1ct Peridot (Emerald, Yellowish Green, 6.78 x 5.02)
- 6ct Sapphire (Cushion, Blue, 10.16 x 10.16) vs. 2.2ct Emerald (Emerald, Green, 9.46 x 7.01)