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5ct Tanzanite (Trillion, 12.81×12.81mm, Blue) vs 2.5ct Diamond (Cushion, 7.91×7.91mm, White)


Quick summary: When looked from above (face-up position), 5ct Tanzanite (12.81×12.81mm, trillion cut) appears 81% larger than 2.5ct Diamond (7.91×7.91mm, cushion cut). See below how they compare side-by-side on a ring and finger.

5ct Tanzanite (trillion cut)
vs
 2.5ct Diamond (cushion cut)
blue
 
white
12.81×12.81 mm 7.91×7.91 mm
actual size
Actual size of 5ct Tanzanite (trillion cut, 12.81×12.81mm, Blue color)   Actual size of 2.5ct Diamond (cushion cut, 7.91×7.91mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 5ct Tanzanite (trillion cut, 12.81×12.81mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 2.5ct Diamond (cushion cut, 7.91×7.91mm) 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
 76% vs 47%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 5ct Tanzanite Trillion (12.81×12.81mm, Blue) and 2.5ct Diamond Cushion (7.91×7.91mm, 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.


5 Ct Tanzanite (Trillion) 2.5 Ct Diamond (Cushion)
12.81×12.81 mm vs 7.91×7.91 mm
101.74 mm²   56.31 mm²
Face-up size outline for 5ct Tanzanite (12.81×12.81mm, trillion cut)
Face-up size outline for 2.5ct Diamond (7.91×7.91mm, cushion cut)
5ct Tanzanite Trillion (12.81×12.81mm)
2.5ct Diamond Cushion (7.91×7.91mm)
Difference: 81% (45.43 mm²)
5ct Tanzanite (Trillion, 12.81×12.81mm) has approx. 81% more face-up area than 2.5ct Diamond (Cushion, 7.91×7.91mm).


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