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1.5ct Tanzanite (Princess, 6.38×6.38mm, Blue) vs 1.5ct Topaz (Princess, 6.27×6.27mm, Blue)


Quick summary: When looked from above (face-up position), 1.5ct Tanzanite (6.38×6.38mm, princess cut) appears 4% larger than 1.5ct Topaz (6.27×6.27mm, princess cut). See below how they compare side-by-side on a ring and finger.

1.5ct Tanzanite (princess cut)
vs
 1.5ct Topaz (princess cut)
blue
 
blue
6.38×6.38 mm 6.27×6.27 mm
actual size
Actual size of 1.5ct Tanzanite (princess cut, 6.38×6.38mm, Blue color)   Actual size of 1.5ct Topaz (princess cut, 6.27×6.27mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1.5ct Tanzanite (princess cut, 6.38×6.38mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 1.5ct Topaz (princess cut, 6.27×6.27mm) 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
 38% vs 38%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.5ct Tanzanite Princess (6.38×6.38mm, Blue) and 1.5ct Topaz Princess (6.27×6.27mm, 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, Topaz will face-up smaller than Tanzanite for a given carat weight, because it has higher specific gravity (3.53 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.


1.5 Ct Tanzanite (Princess) 1.5 Ct Topaz (Princess)
6.38×6.38 mm vs 6.27×6.27 mm
40.7 mm²   39.31 mm²
Face-up size outline for 1.5ct Tanzanite (6.38×6.38mm, princess cut)
Face-up size outline for 1.5ct Topaz (6.27×6.27mm, princess cut)
1.5ct Tanzanite Princess (6.38×6.38mm)
1.5ct Topaz Princess (6.27×6.27mm)
Difference: 4% (1.39 mm²)
1.5ct Tanzanite (Princess, 6.38×6.38mm) has approx. 4% more face-up area than 1.5ct Topaz (Princess, 6.27×6.27mm).


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