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18ct Sunstone (Radiant, 16.56×16.56mm, Orangey Red) vs 18ct Diopside (Radiant, 15.39×15.39mm, Green)


Quick summary: When looked from above (face-up position), 18ct Sunstone (16.56×16.56mm, radiant cut) appears 16% larger than 18ct Diopside (15.39×15.39mm, radiant cut). See below how they compare side-by-side on a ring and finger.

18ct Sunstone (radiant cut)
vs
 18ct Diopside (radiant cut)
orangey red
 
green
16.56×16.56 mm 15.39×15.39 mm
actual size
Actual size of 18ct Sunstone (radiant cut, 16.56×16.56mm, Orangey Red color)   Actual size of 18ct Diopside (radiant cut, 15.39×15.39mm, 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 18ct Sunstone (radiant cut, 16.56×16.56mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 18ct Diopside (radiant cut, 15.39×15.39mm) 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
 98% vs 92%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 18ct Sunstone Radiant (16.56×16.56mm, Orangey Red) and 18ct Diopside Radiant (15.39×15.39mm, 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.


18 Ct Sunstone (Radiant) 18 Ct Diopside (Radiant)
16.56×16.56 mm vs 15.39×15.39 mm
260.52 mm²   225.01 mm²
Face-up size outline for 18ct Sunstone (16.56×16.56mm, radiant cut)
Face-up size outline for 18ct Diopside (15.39×15.39mm, radiant cut)
18ct Sunstone Radiant (16.56×16.56mm)
18ct Diopside Radiant (15.39×15.39mm)
Difference: 16% (35.51 mm²)
18ct Sunstone (Radiant, 16.56×16.56mm) has approx. 16% more face-up area than 18ct Diopside (Radiant, 15.39×15.39mm).


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