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8ct Benitoite (Round, 12.33×12.33mm, Blue) vs 2ct Diamond (Round, 8.19×8.19mm, White)


Quick summary: When looked from above (face-up position), 8ct Benitoite (12.33×12.33mm, round cut) appears 2.3 times larger than 2ct Diamond (8.19×8.19mm, round cut). See below how they compare side-by-side on a ring and finger.

8ct Benitoite (round cut)
vs
 2ct Diamond (round cut)
blue
 
white
12.33×12.33 mm 8.19×8.19 mm
actual size
Actual size of 8ct Benitoite (round cut, 12.33×12.33mm, Blue color)   Actual size of 2ct Diamond (round cut, 8.19×8.19mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 8ct Benitoite (round cut, 12.33×12.33mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 2ct Diamond (round cut, 8.19×8.19mm) 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
 73% vs 49%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 8ct Benitoite Round (12.33×12.33mm, Blue) and 2ct Diamond Round (8.19×8.19mm, 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, Benitoite will face-up smaller than Diamond for a given carat weight, because it has higher specific gravity (3.65 vs. 3.52 - this means it's "heavier" compared to Diamond 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 Ct Benitoite (Round) 2 Ct Diamond (Round)
12.33×12.33 mm vs 8.19×8.19 mm
119.4 mm²   52.68 mm²
Face-up size outline for 8ct Benitoite (12.33×12.33mm, round cut)
Face-up size outline for 2ct Diamond (8.19×8.19mm, round cut)
8ct Benitoite Round (12.33×12.33mm)
2ct Diamond Round (8.19×8.19mm)
Difference: 127% (66.72 mm²)
8ct Benitoite (Round, 12.33×12.33mm) has approx. 127% more face-up area than 2ct Diamond (Round, 8.19×8.19mm). In other words, it's 2.27x larger.


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