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2ct Topaz (Round, 7.85×7.85mm, Blue) vs 2ct Spinel (Round, 7.8×7.8mm, Red)


Quick summary: When looked from above (face-up position), 2ct Topaz (7.85×7.85mm, round cut) appears 1% larger than 2ct Spinel (7.8×7.8mm, round cut). See below how they compare side-by-side on a ring and finger.

2ct Topaz (round cut)
vs
 2ct Spinel (round cut)
blue
 
red
7.85×7.85 mm 7.8×7.8 mm
actual size
Actual size of 2ct Topaz (round cut, 7.85×7.85mm, Blue color)   Actual size of 2ct Spinel (round cut, 7.8×7.8mm, Red color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 2ct Topaz (round cut, 7.85×7.85mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 2ct Spinel (round cut, 7.8×7.8mm) 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
 47% vs 47%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 2ct Topaz Round (7.85×7.85mm, Blue) and 2ct Spinel Round (7.8×7.8mm, Red) 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 Topaz for a given carat weight, because it has higher specific gravity (3.6 vs. 3.53 - this means it's "slightly heavier" compared to Topaz 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.


2 Ct Topaz (Round) 2 Ct Spinel (Round)
7.85×7.85 mm vs 7.8×7.8 mm
48.4 mm²   47.78 mm²
Face-up size outline for 2ct Topaz (7.85×7.85mm, round cut)
Face-up size outline for 2ct Spinel (7.8×7.8mm, round cut)
2ct Topaz Round (7.85×7.85mm)
2ct Spinel Round (7.8×7.8mm)
Difference: 1% (0.62 mm²)
2ct Topaz (Round, 7.85×7.85mm) has approx. 1% more face-up area than 2ct Spinel (Round, 7.8×7.8mm).


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