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1ct Tourmaline (Oval, 8.24×5.49mm, Light Green ) vs 3.5ct Diamond (Round, 9.87×9.87mm, White)


Quick summary: When looked from above (face-up position), 3.5ct Diamond (9.87×9.87mm, round cut) appears 2.1 times larger than 1ct Tourmaline (8.24×5.49mm, oval cut). See below how they compare side-by-side on a ring and finger.

1ct Tourmaline (oval cut)
vs
 3.5ct Diamond (round cut)
light green
 
white
8.24×5.49 mm 9.87×9.87 mm
actual size
Actual size of 1ct Tourmaline (oval cut, 8.24×5.49mm, Light Green color)   Actual size of 3.5ct Diamond (round cut, 9.87×9.87mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Light Green 1ct Tourmaline (oval cut, 8.24×5.49mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 3.5ct Diamond (round cut, 9.87×9.87mm) 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
 33% vs 59%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1ct Tourmaline Oval (8.24×5.49mm, Light Green ) and 3.5ct Diamond Round (9.87×9.87mm, 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, Diamond will face-up smaller than Tourmaline for a given carat weight, because it has higher specific gravity (3.52 vs. 3.06 - this means it's "heavier" compared to Tourmaline 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 Tourmaline (Oval) 3.5 Ct Diamond (Round)
8.24×5.49 mm vs 9.87×9.87 mm
37.09 mm²   76.51 mm²
Face-up size outline for 3.5ct Diamond (9.87×9.87mm, round cut)
Face-up size outline for 1ct Tourmaline (8.24×5.49mm, oval cut)
1ct Tourmaline Oval (8.24×5.49mm)
3.5ct Diamond Round (9.87×9.87mm)
Difference: 106% (39.42 mm²)
3.5ct Diamond (Round, 9.87×9.87mm) has approx. 106% more face-up area than 1ct Tourmaline (Oval, 8.24×5.49mm). In other words, it's 2.06x larger.


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