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8.5ct Tanzanite (Cabochon, 14.9×9.93mm, Blue) vs 1ct Diamond (Cushion, 5.83×5.83mm, White)


Quick summary: When looked from above (face-up position), 8.5ct Tanzanite (14.9×9.93mm, cabochon cut) appears 4 times larger than 1ct Diamond (5.83×5.83mm, cushion cut). See below how they compare side-by-side on a ring and finger.

8.5ct Tanzanite (cabochon cut)
vs
 1ct Diamond (cushion cut)
blue
 
white
14.9×9.93 mm 5.83×5.83 mm
actual size
Actual size of 8.5ct Tanzanite (cabochon cut, 14.9×9.93mm, Blue color)   Actual size of 1ct Diamond (cushion cut, 5.83×5.83mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 8.5ct Tanzanite (cabochon cut, 14.9×9.93mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 1ct Diamond (cushion cut, 5.83×5.83mm) 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
 59% vs 35%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8.5ct Tanzanite Cabochon (14.9×9.93mm, Blue) and 1ct Diamond Cushion (5.83×5.83mm, 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.


8.5 Ct Tanzanite (Cabochon) 1 Ct Diamond (Cushion)
14.9×9.93 mm vs 5.83×5.83 mm
121.32 mm²   30.59 mm²
Face-up size outline for 8.5ct Tanzanite (14.9×9.93mm, cabochon cut)
Face-up size outline for 1ct Diamond (5.83×5.83mm, cushion cut)
8.5ct Tanzanite Cabochon (14.9×9.93mm)
1ct Diamond Cushion (5.83×5.83mm)
Difference: 297% (90.73 mm²)
8.5ct Tanzanite (Cabochon, 14.9×9.93mm) has approx. 297% more face-up area than 1ct Diamond (Cushion, 5.83×5.83mm). In other words, it's 3.97x larger.


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