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1.51ct Diamond (Round, 7.46×7.46mm, White) vs 1.3ct Tanzanite (Round, 6.96×6.96mm, Blue)


Quick summary: When looked from above (face-up position), 1.51ct Diamond (7.46×7.46mm, round cut) appears 15% larger than 1.3ct Tanzanite (6.96×6.96mm, round cut). See below how they compare side-by-side on a ring and finger.

1.51ct Diamond (round cut)
vs
 1.3ct Tanzanite (round cut)
white
 
blue
7.46×7.46 mm 6.96×6.96 mm
actual size
Actual size of 1.51ct Diamond (round cut, 7.46×7.46mm, White color)   Actual size of 1.3ct Tanzanite (round cut, 6.96×6.96mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 1.51ct Diamond (round cut, 7.46×7.46mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 1.3ct Tanzanite (round cut, 6.96×6.96mm) 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 42%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.51ct Diamond Round (7.46×7.46mm, White) and 1.3ct Tanzanite Round (6.96×6.96mm, 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.


1.51 Ct Diamond (Round) 1.3 Ct Tanzanite (Round)
7.46×7.46 mm vs 6.96×6.96 mm
43.71 mm²   38.05 mm²
Face-up size outline for 1.51ct Diamond (7.46×7.46mm, round cut)
Face-up size outline for 1.3ct Tanzanite (6.96×6.96mm, round cut)
1.51ct Diamond Round (7.46×7.46mm)
1.3ct Tanzanite Round (6.96×6.96mm)
Difference: 15% (5.66 mm²)
1.51ct Diamond (Round, 7.46×7.46mm) has approx. 15% more face-up area than 1.3ct Tanzanite (Round, 6.96×6.96mm).


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