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2.75ct Diamond (Oval, 11.37×7.58mm, White) vs 2.5ct Tanzanite (Trillion, 10.17×10.17mm, Blue)


Quick summary: When looked from above (face-up position), 2.75ct Diamond (11.37×7.58mm, oval cut) appears 10% larger than 2.5ct Tanzanite (10.17×10.17mm, trillion cut). See below how they compare side-by-side on a ring and finger.

2.75ct Diamond (oval cut)
vs
 2.5ct Tanzanite (trillion cut)
white
 
blue
11.37×7.58 mm 10.17×10.17 mm
actual size
Actual size of 2.75ct Diamond (oval cut, 11.37×7.58mm, White color)   Actual size of 2.5ct Tanzanite (trillion cut, 10.17×10.17mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 2.75ct Diamond (oval cut, 11.37×7.58mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 2.5ct Tanzanite (trillion cut, 10.17×10.17mm) 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
 45% vs 61%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 2.75ct Diamond Oval (11.37×7.58mm, White) and 2.5ct Tanzanite Trillion (10.17×10.17mm, 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, Diamond will face-up smaller than Tanzanite for a given carat weight, because it has higher specific gravity (3.52 vs. 3.35 - this means it's "heavier" compared to Tanzanite 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.


2.75 Ct Diamond (Oval) 2.5 Ct Tanzanite (Trillion)
11.37×7.58 mm vs 10.17×10.17 mm
70.67 mm²   64.13 mm²
Face-up size outline for 2.75ct Diamond (11.37×7.58mm, oval cut)
Face-up size outline for 2.5ct Tanzanite (10.17×10.17mm, trillion cut)
2.75ct Diamond Oval (11.37×7.58mm)
2.5ct Tanzanite Trillion (10.17×10.17mm)
Difference: 10% (6.54 mm²)
2.75ct Diamond (Oval, 11.37×7.58mm) has approx. 10% more face-up area than 2.5ct Tanzanite (Trillion, 10.17×10.17mm).


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