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3ct Benitoite (Round, 8.89×8.89mm, Blue) vs 3ct Tanzanite (Round, 9.15×9.15mm, Blue)


Quick summary: When looked from above (face-up position), 3ct Tanzanite (9.15×9.15mm, round cut) appears 6% larger than 3ct Benitoite (8.89×8.89mm, round cut). See below how they compare side-by-side on a ring and finger.

3ct Benitoite (round cut)
vs
 3ct Tanzanite (round cut)
blue
 
blue
8.89×8.89 mm 9.15×9.15 mm
actual size
Actual size of 3ct Benitoite (round cut, 8.89×8.89mm, Blue color)   Actual size of 3ct Tanzanite (round cut, 9.15×9.15mm, Blue color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 3ct Benitoite (round cut, 8.89×8.89mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 3ct Tanzanite (round cut, 9.15×9.15mm) 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
 53% vs 55%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 3ct Benitoite Round (8.89×8.89mm, Blue) and 3ct Tanzanite Round (9.15×9.15mm, 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, Benitoite will face-up smaller than Tanzanite for a given carat weight, because it has higher specific gravity (3.65 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.


3 Ct Benitoite (Round) 3 Ct Tanzanite (Round)
8.89×8.89 mm vs 9.15×9.15 mm
62.07 mm²   65.76 mm²
Face-up size outline for 3ct Tanzanite (9.15×9.15mm, round cut)
Face-up size outline for 3ct Benitoite (8.89×8.89mm, round cut)
3ct Benitoite Round (8.89×8.89mm)
3ct Tanzanite Round (9.15×9.15mm)
Difference: 6% (3.69 mm²)
3ct Tanzanite (Round, 9.15×9.15mm) has approx. 6% more face-up area than 3ct Benitoite (Round, 8.89×8.89mm).


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