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1ct Spinel (Oval, 7.83×5.22mm, Light Blue) vs 1ct Topaz (Oval, 7.89×5.26mm, Gray)


Quick summary: When looked from above (face-up position), 1ct Topaz (7.89×5.26mm, oval cut) appears 2% larger than 1ct Spinel (7.83×5.22mm, oval cut). See below how they compare side-by-side on a ring and finger.

1ct Spinel (oval cut)
vs
 1ct Topaz (oval cut)
light blue
 
gray
7.83×5.22 mm 7.89×5.26 mm
actual size
Actual size of 1ct Spinel (oval cut, 7.83×5.22mm, Light Blue color)   Actual size of 1ct Topaz (oval cut, 7.89×5.26mm, Gray color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Light Blue 1ct Spinel (oval cut, 7.83×5.22mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Gray 1ct Topaz (oval cut, 7.89×5.26mm) 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
 31% vs 32%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1ct Spinel Oval (7.83×5.22mm, Light Blue) and 1ct Topaz Oval (7.89×5.26mm, Gray) 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.


1 Ct Spinel (Oval) 1 Ct Topaz (Oval)
7.83×5.22 mm vs 7.89×5.26 mm
33.52 mm²   34.03 mm²
Face-up size outline for 1ct Topaz (7.89×5.26mm, oval cut)
Face-up size outline for 1ct Spinel (7.83×5.22mm, oval cut)
1ct Spinel Oval (7.83×5.22mm)
1ct Topaz Oval (7.89×5.26mm)
Difference: 2% (0.51 mm²)
1ct Topaz (Oval, 7.89×5.26mm) has approx. 2% more face-up area than 1ct Spinel (Oval, 7.83×5.22mm).


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