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0.75ct Tanzanite (Round, 5.79×5.79mm, Blue) vs 0.28ct Diamond (Round, 4.25×4.25mm, White)


Quick summary: When looked from above (face-up position), 0.75ct Tanzanite (5.79×5.79mm, round cut) appears 86% larger than 0.28ct Diamond (4.25×4.25mm, round cut). See below how they compare side-by-side on a ring and finger.

0.75ct Tanzanite (round cut)
vs
 0.28ct Diamond (round cut)
blue
 
white
5.79×5.79 mm 4.25×4.25 mm
actual size
Actual size of 0.75ct Tanzanite (round cut, 5.79×5.79mm, Blue color)   Actual size of 0.28ct Diamond (round cut, 4.25×4.25mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 0.75ct Tanzanite (round cut, 5.79×5.79mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.28ct Diamond (round cut, 4.25×4.25mm) 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
 35% vs 26%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.75ct Tanzanite Round (5.79×5.79mm, Blue) and 0.28ct Diamond Round (4.25×4.25mm, 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, 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.


0.75 Ct Tanzanite (Round) 0.28 Ct Diamond (Round)
5.79×5.79 mm vs 4.25×4.25 mm
26.33 mm²   14.19 mm²
Face-up size outline for 0.75ct Tanzanite (5.79×5.79mm, round cut)
Face-up size outline for 0.28ct Diamond (4.25×4.25mm, round cut)
0.75ct Tanzanite Round (5.79×5.79mm)
0.28ct Diamond Round (4.25×4.25mm)
Difference: 86% (12.14 mm²)
0.75ct Tanzanite (Round, 5.79×5.79mm) has approx. 86% more face-up area than 0.28ct Diamond (Round, 4.25×4.25mm).


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