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1.21ct Spinel (Oval, 8×6mm, Red) vs 0.42ct Diamond (Marquise, 8×3.7mm, White)


Quick summary: When looked from above (face-up position), 1.21ct Spinel (8×6mm, oval cut) appears 87% larger than 0.42ct Diamond (8×3.7mm, marquise cut). See below how they compare side-by-side on a ring and finger.

1.21ct Spinel (oval cut)
vs
 0.42ct Diamond (marquise cut)
red
 
white
8×6 mm 8×3.7 mm
actual size
Actual size of 1.21ct Spinel (oval cut, 8×6mm, Red color)   Actual size of 0.42ct Diamond (marquise cut, 8×3.7mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 1.21ct Spinel (oval cut, 8×6mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.42ct Diamond (marquise cut, 8×3.7mm) 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
 36% vs 22%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.21ct Spinel Oval (8×6mm, Red) and 0.42ct Diamond Marquise (8×3.7mm, 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, Spinel will face-up slightly smaller than Diamond for a given carat weight, because it has higher specific gravity (3.6 vs. 3.52 - this means it's "slightly 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.


1.21 Ct Spinel (Oval) 0.42 Ct Diamond (Marquise)
8×6 mm vs 8×3.7 mm
39.36 mm²   21.02 mm²
Face-up size outline for 1.21ct Spinel (8×6mm, oval cut)
Face-up size outline for 0.42ct Diamond (8×3.7mm, marquise cut)
1.21ct Spinel Oval (8×6mm)
0.42ct Diamond Marquise (8×3.7mm)
Difference: 87% (18.34 mm²)
1.21ct Spinel (Oval, 8×6mm) has approx. 87% more face-up area than 0.42ct Diamond (Marquise, 8×3.7mm).


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