12ct Sapphire (Oval, 17.31×11.54mm, Blue) vs 12ct Diamond (Oval, 18.59×12.39mm, White)
Quick summary: When looked from above (face-up position), 12ct Diamond (18.59×12.39mm, oval cut) appears 15% larger than 12ct Sapphire (17.31×11.54mm, oval cut). See below how they compare side-by-side on a ring and finger.
| 12ct Sapphire (oval cut) |
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12ct Diamond (oval cut) |
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blue |
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| 17.31×11.54 mm | 18.59×12.39 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
12ct Sapphire Oval (17.31×11.54mm, Blue)
and
12ct Diamond Oval (18.59×12.39mm, 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.
| 12 Ct Sapphire (Oval) | 12 Ct Diamond (Oval) | |
| 17.31×11.54 mm | vs | 18.59×12.39 mm |
| 163.8 mm² | 188.87 mm² |
| 12ct Sapphire Oval (17.31×11.54mm) | |
| 12ct Diamond Oval (18.59×12.39mm) | |
| Difference: 15% (25.07 mm²) |
12ct Diamond (Oval, 18.59×12.39mm) has approx. 15% more face-up area than 12ct Sapphire (Oval, 17.31×11.54mm).
Popular comparisons:
- 12ct Sapphire (Oval, Blue, 17.31 x 11.54) vs. 11ct Sapphire (Oval, Blue, 16.82 x 11.21)
- 12ct Sapphire (Oval, Blue, 17.31 x 11.54) vs. 6ct Sapphire (Oval, Blue, 13.74 x 9.16)
- 12ct Sapphire (Oval, Blue, 17.31 x 11.54) vs. 2.6ct Sapphire (Oval, Blue, 9 x 7)
- 12ct Sapphire (Oval, Blue, 17.31 x 11.54) vs. 10ct Sapphire (Oval, Blue, 16.29 x 10.86)
- 12ct Sapphire (Oval, Blue, 17.31 x 11.54) vs. 5.7ct Topaz (Oval, Blue, 14 x 10)
- 12ct Sapphire (Oval, Blue, 17.31 x 11.54) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 12ct Sapphire (Oval, Blue, 17.31 x 11.54) vs. 12ct Tanzanite (Oval, Blue, 18.47 x 12.31)
- 12ct Sapphire (Oval, Blue, 17.31 x 11.54) vs. 11ct Sapphire (Cabochon, Blue, 15.23 x 10.15)