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2.5ct Amethyst (Round, 9.31×9.31mm, Violet) vs 1.65ct Sapphire (Emerald, 7.8×5.8mm, Blue)


Quick summary: When looked from above (face-up position), 2.5ct Amethyst (9.31×9.31mm, round cut) appears 62% larger than 1.65ct Sapphire (7.8×5.8mm, emerald cut). See below how they compare side-by-side on a ring and finger.

2.5ct Amethyst (round cut)
vs
 1.65ct Sapphire (emerald cut)
violet
 
blue
9.31×9.31 mm 7.8×5.8 mm
actual size
Actual size of 2.5ct Amethyst (round cut, 9.31×9.31mm, Violet color)   Actual size of 1.65ct Sapphire (emerald cut, 7.8×5.8mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Violet 2.5ct Amethyst (round cut, 9.31×9.31mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 1.65ct Sapphire (emerald cut, 7.8×5.8mm) on a right ring and finger
Your settings
Ring
 Gold
Skin tone
 Light
Ring diameter
 16.9 mm
Ring width
 3.0 mm
Finger length
 64 mm
Finger coverage
 56% vs 35%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 2.5ct Amethyst Round (9.31×9.31mm, Violet) and 1.65ct Sapphire Emerald (7.8×5.8mm, Blue) 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.


2.5 Ct Amethyst (Round) 1.65 Ct Sapphire (Emerald)
9.31×9.31 mm vs 7.8×5.8 mm
68.08 mm²   42.07 mm²
Face-up size outline for 2.5ct Amethyst (9.31×9.31mm, round cut)
Face-up size outline for 1.65ct Sapphire (7.8×5.8mm, emerald cut)
2.5ct Amethyst Round (9.31×9.31mm)
1.65ct Sapphire Emerald (7.8×5.8mm)
Difference: 62% (26.01 mm²)
2.5ct Amethyst (Round, 9.31×9.31mm) has approx. 62% more face-up area than 1.65ct Sapphire (Emerald, 7.8×5.8mm).


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