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20ct Sapphire (Baguette, 18.81×12.54mm, Blue) vs 15ct Peridot (Oval, 19.79×13.19mm, Yellowish Green)


Quick summary: When looked from above (face-up position), 20ct Sapphire (18.81×12.54mm, baguette cut) appears 10% larger than 15ct Peridot (19.79×13.19mm, oval cut). See below how they compare side-by-side on a ring and finger.

20ct Sapphire (baguette cut)
vs
 15ct Peridot (oval cut)
blue
 
yellowish green
18.81×12.54 mm 19.79×13.19 mm
actual size
Actual size of 20ct Sapphire (baguette cut, 18.81×12.54mm, Blue color)   Actual size of 15ct Peridot (oval cut, 19.79×13.19mm, Yellowish Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 20ct Sapphire (baguette cut, 18.81×12.54mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Yellowish Green 15ct Peridot (oval cut, 19.79×13.19mm) 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
 75% vs 79%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 20ct Sapphire Baguette (18.81×12.54mm, Blue) and 15ct Peridot Oval (19.79×13.19mm, Yellowish 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, Sapphire will face-up smaller than Peridot for a given carat weight, because it has higher specific gravity (4 vs. 3.34 - this means it's "heavier" compared to Peridot 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.


20 Ct Sapphire (Baguette) 15 Ct Peridot (Oval)
18.81×12.54 mm vs 19.79×13.19 mm
235.88 mm²   214.04 mm²
Face-up size outline for 20ct Sapphire (18.81×12.54mm, baguette cut)
Face-up size outline for 15ct Peridot (19.79×13.19mm, oval cut)
20ct Sapphire Baguette (18.81×12.54mm)
15ct Peridot Oval (19.79×13.19mm)
Difference: 10% (21.84 mm²)
20ct Sapphire (Baguette, 18.81×12.54mm) has approx. 10% more face-up area than 15ct Peridot (Oval, 19.79×13.19mm).


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