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40ct Sunstone (Cushion, 21.72×21.72mm, Orangey Red) vs 40ct Diopside (Cushion, 20.18×20.18mm, Green)


Quick summary: When looked from above (face-up position), 40ct Sunstone (21.72×21.72mm, cushion cut) appears 16% larger than 40ct Diopside (20.18×20.18mm, cushion cut). See below how they compare side-by-side on a ring and finger.

40ct Sunstone (cushion cut)
vs
 40ct Diopside (cushion cut)
orangey red
 
green
21.72×21.72 mm 20.18×20.18 mm
actual size
Actual size of 40ct Sunstone (cushion cut, 21.72×21.72mm, Orangey Red color)   Actual size of 40ct Diopside (cushion cut, 20.18×20.18mm, Green color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Orangey Red 40ct Sunstone (cushion cut, 21.72×21.72mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 40ct Diopside (cushion cut, 20.18×20.18mm) 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
 129% vs 120%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 40ct Sunstone Cushion (21.72×21.72mm, Orangey Red) and 40ct Diopside Cushion (20.18×20.18mm, Green) 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, Diopside will face-up smaller than Sunstone for a given carat weight, because it has higher specific gravity (3.3 vs. 2.65 - this means it's "heavier" compared to Sunstone 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.


40 Ct Sunstone (Cushion) 40 Ct Diopside (Cushion)
21.72×21.72 mm vs 20.18×20.18 mm
424.58 mm²   366.51 mm²
Face-up size outline for 40ct Sunstone (21.72×21.72mm, cushion cut)
Face-up size outline for 40ct Diopside (20.18×20.18mm, cushion cut)
40ct Sunstone Cushion (21.72×21.72mm)
40ct Diopside Cushion (20.18×20.18mm)
Difference: 16% (58.07 mm²)
40ct Sunstone (Cushion, 21.72×21.72mm) has approx. 16% more face-up area than 40ct Diopside (Cushion, 20.18×20.18mm).


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