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1.88ct Diamond (Round, 8.02×8.02mm, White) vs 1.5ct Tourmaline (Round, 7.45×7.45mm, Red)


Quick summary: When looked from above (face-up position), 1.88ct Diamond (8.02×8.02mm, round cut) appears 16% larger than 1.5ct Tourmaline (7.45×7.45mm, round cut). See below how they compare side-by-side on a ring and finger.

1.88ct Diamond (round cut)
vs
 1.5ct Tourmaline (round cut)
white
 
red
8.02×8.02 mm 7.45×7.45 mm
actual size
Actual size of 1.88ct Diamond (round cut, 8.02×8.02mm, White color)   Actual size of 1.5ct Tourmaline (round cut, 7.45×7.45mm, Red color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 1.88ct Diamond (round cut, 8.02×8.02mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 1.5ct Tourmaline (round cut, 7.45×7.45mm) 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
 48% vs 45%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.88ct Diamond Round (8.02×8.02mm, White) and 1.5ct Tourmaline Round (7.45×7.45mm, 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, 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.


1.88 Ct Diamond (Round) 1.5 Ct Tourmaline (Round)
8.02×8.02 mm vs 7.45×7.45 mm
50.52 mm²   43.59 mm²
Face-up size outline for 1.88ct Diamond (8.02×8.02mm, round cut)
Face-up size outline for 1.5ct Tourmaline (7.45×7.45mm, round cut)
1.88ct Diamond Round (8.02×8.02mm)
1.5ct Tourmaline Round (7.45×7.45mm)
Difference: 16% (6.93 mm²)
1.88ct Diamond (Round, 8.02×8.02mm) has approx. 16% more face-up area than 1.5ct Tourmaline (Round, 7.45×7.45mm).


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