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1ct Kunzite (Round, 6.45×6.45mm, Light Purple) vs 1ct Tanzanite (Round, 6.37×6.37mm, Blue)


Quick summary: When looked from above (face-up position), 1ct Kunzite (6.45×6.45mm, round cut) appears 3% larger than 1ct Tanzanite (6.37×6.37mm, round cut). See below how they compare side-by-side on a ring and finger.

1ct Kunzite (round cut)
vs
 1ct Tanzanite (round cut)
light purple
 
blue
6.45×6.45 mm 6.37×6.37 mm
actual size
Actual size of 1ct Kunzite (round cut, 6.45×6.45mm, Light Purple color)   Actual size of 1ct Tanzanite (round cut, 6.37×6.37mm, Blue color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Light Purple 1ct Kunzite (round cut, 6.45×6.45mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 1ct Tanzanite (round cut, 6.37×6.37mm) 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
 39% vs 38%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1ct Kunzite Round (6.45×6.45mm, Light Purple) and 1ct Tanzanite Round (6.37×6.37mm, 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, Tanzanite will face-up smaller than Kunzite for a given carat weight, because it has higher specific gravity (3.35 vs. 3.18 - this means it's "heavier" compared to Kunzite 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 Ct Kunzite (Round) 1 Ct Tanzanite (Round)
6.45×6.45 mm vs 6.37×6.37 mm
32.67 mm²   31.87 mm²
Face-up size outline for 1ct Kunzite (6.45×6.45mm, round cut)
Face-up size outline for 1ct Tanzanite (6.37×6.37mm, round cut)
1ct Kunzite Round (6.45×6.45mm)
1ct Tanzanite Round (6.37×6.37mm)
Difference: 3% (0.8 mm²)
1ct Kunzite (Round, 6.45×6.45mm) has approx. 3% more face-up area than 1ct Tanzanite (Round, 6.37×6.37mm).


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