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1.75ct Benitoite (Marquise, 12.26×6.13mm, Dark Blue) vs 3.12ct Sinhalite (Cabochon, 10.47×6.98mm, Brown)


Quick summary: When looked from above (face-up position), 3.12ct Sinhalite (10.47×6.98mm, cabochon cut) appears 12% larger than 1.75ct Benitoite (12.26×6.13mm, marquise cut). See below how they compare side-by-side on a ring and finger.

1.75ct Benitoite (marquise cut)
vs
 3.12ct Sinhalite (cabochon cut)
dark blue
 
brown
12.26×6.13 mm 10.47×6.98 mm
actual size
Actual size of 1.75ct Benitoite (marquise cut, 12.26×6.13mm, Dark Blue color)   Actual size of 3.12ct Sinhalite (cabochon cut, 10.47×6.98mm, Brown color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Dark Blue 1.75ct Benitoite (marquise cut, 12.26×6.13mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Brown 3.12ct Sinhalite (cabochon cut, 10.47×6.98mm) 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
 37% vs 42%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 1.75ct Benitoite Marquise (12.26×6.13mm, Dark Blue) and 3.12ct Sinhalite Cabochon (10.47×6.98mm, Brown) 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 Sinhalite for a given carat weight, because it has higher specific gravity (3.65 vs. 3.48 - this means it's "heavier" compared to Sinhalite 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.


1.75 Ct Benitoite (Marquise) 3.12 Ct Sinhalite (Cabochon)
12.26×6.13 mm vs 10.47×6.98 mm
53.36 mm²   59.93 mm²
Face-up size outline for 3.12ct Sinhalite (10.47×6.98mm, cabochon cut)
Face-up size outline for 1.75ct Benitoite (12.26×6.13mm, marquise cut)
1.75ct Benitoite Marquise (12.26×6.13mm)
3.12ct Sinhalite Cabochon (10.47×6.98mm)
Difference: 12% (6.57 mm²)
3.12ct Sinhalite (Cabochon, 10.47×6.98mm) has approx. 12% more face-up area than 1.75ct Benitoite (Marquise, 12.26×6.13mm).


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