4ct Sapphire (Oval, 12×8mm, Blue) vs 4ct Diamond (Oval, 12.89×8.59mm, White)
Quick summary: When looked from above (face-up position), 4ct Diamond (12.89×8.59mm, oval cut) appears 15% larger than 4ct Sapphire (12×8mm, oval cut). See below how they compare side-by-side on a ring and finger.
| 4ct Sapphire (oval cut) |
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4ct Diamond (oval cut) |
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blue |
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| 12×8 mm | 12.89×8.59 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 Oval (12×8mm, Blue)
and
4ct Diamond Oval (12.89×8.59mm, 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 (Oval) | 4 Ct Diamond (Oval) | |
| 12×8 mm | vs | 12.89×8.59 mm |
| 78.72 mm² | 90.79 mm² |
| 4ct Sapphire Oval (12×8mm) | |
| 4ct Diamond Oval (12.89×8.59mm) | |
| Difference: 15% (12.07 mm²) |
4ct Diamond (Oval, 12.89×8.59mm) has approx. 15% more face-up area than 4ct Sapphire (Oval, 12×8mm).
Popular comparisons:
- 4ct Sapphire (Oval, Blue, 12 x 8) vs. 2ct Diamond (Oval, White, 10.23 x 6.82)
- 4ct Sapphire (Oval, Blue, 12 x 8) vs. 4ct Emerald (Emerald, Green, 11.56 x 8.56)
- 4ct Sapphire (Oval, Blue, 12 x 8) vs. 3ct Diamond (Oval, White, 11.7 x 7.8)
- 4ct Sapphire (Oval, Blue, 12 x 8) vs. 4ct Emerald (Oval, Green, 13.68 x 9.12)
- 4ct Sapphire (Oval, Blue, 12 x 8) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 4ct Sapphire (Oval, Blue, 12 x 8) vs. 5ct Emerald (Emerald, Green, 12.45 x 9.22)
- 4ct Sapphire (Oval, Blue, 12 x 8) vs. 1.8ct Diamond (Princess, White, 6.7 x 6.7)
- 4ct Sapphire (Oval, Blue, 12 x 8) vs. 12ct Sapphire (Oval, Blue, 17.31 x 11.54)
Use the simulator on this page to play around with different ring and finger configurations.