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2.5ct Tanzanite (Round, 8.65×8.65mm, Blue) vs 2ct Amethyst (Emerald, 9.23×6.84mm, Violet)


Quick summary: When looked from above (face-up position), 2.5ct Tanzanite (8.65×8.65mm, round cut) appears 0.1% larger than 2ct Amethyst (9.23×6.84mm, emerald cut). See below how they compare side-by-side on a ring and finger.

2.5ct Tanzanite (round cut)
vs
 2ct Amethyst (emerald cut)
blue
 
violet
8.65×8.65 mm 9.23×6.84 mm
actual size
Actual size of 2.5ct Tanzanite (round cut, 8.65×8.65mm, Blue color)   Actual size of 2ct Amethyst (emerald cut, 9.23×6.84mm, Violet color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 2.5ct Tanzanite (round cut, 8.65×8.65mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Violet 2ct Amethyst (emerald cut, 9.23×6.84mm) 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
 52% vs 41%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 2.5ct Tanzanite Round (8.65×8.65mm, Blue) and 2ct Amethyst Emerald (9.23×6.84mm, 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, Tanzanite will face-up smaller than Amethyst for a given carat weight, because it has higher specific gravity (3.35 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 Tanzanite (Round) 2 Ct Amethyst (Emerald)
8.65×8.65 mm vs 9.23×6.84 mm
58.77 mm²   58.71 mm²
Face-up size outline for 2.5ct Tanzanite (8.65×8.65mm, round cut)
Face-up size outline for 2ct Amethyst (9.23×6.84mm, emerald cut)
2.5ct Tanzanite Round (8.65×8.65mm)
2ct Amethyst Emerald (9.23×6.84mm)
Difference: 0.1% (0.06 mm²)
2.5ct Tanzanite (Round, 8.65×8.65mm) has approx. 0.1% more face-up area than 2ct Amethyst (Emerald, 9.23×6.84mm).


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