12ct Sapphire (Emerald, 14.62×10.83mm, Blue) vs 10ct Amethyst (Oval, 18.69×12.46mm, Violet)
Quick summary: When looked from above (face-up position), 10ct Amethyst (18.69×12.46mm, oval cut) appears 30% larger than 12ct Sapphire (14.62×10.83mm, emerald cut). See below how they compare side-by-side on a ring and finger.
| 12ct Sapphire (emerald cut) |
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10ct Amethyst (oval cut) |
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blue |
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| 14.62×10.83 mm | 18.69×12.46 mm | |
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Actual sizes of
12ct Sapphire Emerald (14.62×10.83mm, Blue)
and
10ct Amethyst Oval (18.69×12.46mm, Violet)
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 Amethyst for a given
carat weight, because it has higher specific gravity
(4 vs. 2.65 - this means it's "heavier" compared to Amethyst 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 (Emerald) | 10 Ct Amethyst (Oval) | |
| 14.62×10.83 mm | vs | 18.69×12.46 mm |
| 147.25 mm² | 190.96 mm² |
| 12ct Sapphire Emerald (14.62×10.83mm) | |
| 10ct Amethyst Oval (18.69×12.46mm) | |
| Difference: 30% (43.71 mm²) |
10ct Amethyst Oval (18.69×12.46mm) has approx. 30% more face-up area than 12ct Sapphire Emerald (14.62×10.83mm).
Popular comparisons:
- 12ct Sapphire (Emerald, Blue, 14.62 x 10.83) vs. 12ct Quartz (Emerald, Blue, 16.77 x 12.42)
- 12ct Sapphire (Emerald, Blue, 14.62 x 10.83) vs. 12ct Diamond (Emerald, Blue, 15.3 x 11.33)
- 12ct Sapphire (Emerald, Blue, 14.62 x 10.83) vs. 12ct Sapphire (Oval, Blue, 17.31 x 11.54)
- 12ct Sapphire (Emerald, Blue, 14.62 x 10.83) vs. 1ct Diamond (Cabochon, White, 7.14 x 4.76)
- 12ct Sapphire (Emerald, Blue, 14.62 x 10.83) vs. 1ct Diamond (Emerald, White, 6.68 x 4.95)
- 12ct Sapphire (Emerald, Blue, 14.62 x 10.83) vs. 2ct Diamond (Princess, White, 6.94 x 6.94)
- 12ct Sapphire (Emerald, Blue, 14.62 x 10.83) vs. 1ct Quartz (Emerald, Blue, 7.33 x 5.43)
- 12ct Sapphire (Emerald, Blue, 14.62 x 10.83) vs. 10ct Quartz (Emerald, Blue, 15.78 x 11.69)
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Actual size is currently adjusted to screen.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a gem, ring and finger will not be shown correctly.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a gem, ring and finger will not be shown correctly.