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1.09ct Benitoite (Oval, 8×4.5mm, Blue) vs 0.75ct Diamond (Round, 5.91×5.91mm, White)


Quick summary: When looked from above (face-up position), 1.09ct Benitoite (8×4.5mm, oval cut) appears 8% larger than 0.75ct Diamond (5.91×5.91mm, round cut). See below how they compare side-by-side on a ring and finger.

1.09ct Benitoite (oval cut)
vs
 0.75ct Diamond (round cut)
blue
 
white
8×4.5 mm 5.91×5.91 mm
actual size
Actual size of 1.09ct Benitoite (oval cut, 8×4.5mm, Blue color)   Actual size of 0.75ct Diamond (round cut, 5.91×5.91mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 1.09ct Benitoite (oval cut, 8×4.5mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.75ct Diamond (round cut, 5.91×5.91mm) 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
 27% vs 35%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.09ct Benitoite Oval (8×4.5mm, Blue) and 0.75ct Diamond Round (5.91×5.91mm, 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.


1.09 Ct Benitoite (Oval) 0.75 Ct Diamond (Round)
8×4.5 mm vs 5.91×5.91 mm
29.52 mm²   27.43 mm²
Face-up size outline for 1.09ct Benitoite (8×4.5mm, oval cut)
Face-up size outline for 0.75ct Diamond (5.91×5.91mm, round cut)
1.09ct Benitoite Oval (8×4.5mm)
0.75ct Diamond Round (5.91×5.91mm)
Difference: 8% (2.09 mm²)
1.09ct Benitoite (Oval, 8×4.5mm) has approx. 8% more face-up area than 0.75ct Diamond (Round, 5.91×5.91mm).


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