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40ct Topaz (Oval, 26.97×17.98mm, Blue) vs 10ct Amethyst (Pear, 19×15mm, Violet)


Quick summary: When looked from above (face-up position), 40ct Topaz (26.97×17.98mm, oval cut) appears 91% larger than 10ct Amethyst (19×15mm, pear cut). See below how they compare side-by-side on a ring and finger.

40ct Topaz (oval cut)
vs
 10ct Amethyst (pear cut)
blue
 
violet
26.97×17.98 mm 19×15 mm
actual size
Actual size of 40ct Topaz (oval cut, 26.97×17.98mm, Blue color)   Actual size of 10ct Amethyst (pear cut, 19×15mm, Violet color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 40ct Topaz (oval cut, 26.97×17.98mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Violet 10ct Amethyst (pear cut, 19×15mm) 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
 107% vs 89%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 40ct Topaz Oval (26.97×17.98mm, Blue) and 10ct Amethyst Pear (19×15mm, Violet) 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, Topaz will face-up smaller than Amethyst for a given carat weight, because it has higher specific gravity (3.53 vs. 2.65 - this means it's "heavier" compared to Amethyst 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 Topaz (Oval) 10 Ct Amethyst (Pear)
26.97×17.98 mm vs 19×15 mm
397.63 mm²   208.05 mm²
Face-up size outline for 40ct Topaz (26.97×17.98mm, oval cut)
Face-up size outline for 10ct Amethyst (19×15mm, pear cut)
40ct Topaz Oval (26.97×17.98mm)
10ct Amethyst Pear (19×15mm)
Difference: 91% (189.58 mm²)
40ct Topaz (Oval, 26.97×17.98mm) has approx. 91% more face-up area than 10ct Amethyst (Pear, 19×15mm).


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