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7ct Diamond (Round, 12.43×12.43mm, White) vs 40ct Apatite (Round, 22.02×22.02mm, Red)


Quick summary: When looked from above (face-up position), 40ct Apatite (22.02×22.02mm, round cut) appears 3.1 times larger than 7ct Diamond (12.43×12.43mm, round cut). See below how they compare side-by-side on a ring and finger.

7ct Diamond (round cut)
vs
 40ct Apatite (round cut)
white
 
red
12.43×12.43 mm 22.02×22.02 mm
actual size
Actual size of 7ct Diamond (round cut, 12.43×12.43mm, White color)   Actual size of 40ct Apatite (round cut, 22.02×22.02mm, Red color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 7ct Diamond (round cut, 12.43×12.43mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Red 40ct Apatite (round cut, 22.02×22.02mm) 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
 74% vs 131%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 7ct Diamond Round (12.43×12.43mm, White) and 40ct Apatite Round (22.02×22.02mm, 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 Apatite for a given carat weight, because it has higher specific gravity (3.52 vs. 3.2 - this means it's "heavier" compared to Apatite 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.


7 Ct Diamond (Round) 40 Ct Apatite (Round)
12.43×12.43 mm vs 22.02×22.02 mm
121.35 mm²   380.82 mm²
Face-up size outline for 40ct Apatite (22.02×22.02mm, round cut)
Face-up size outline for 7ct Diamond (12.43×12.43mm, round cut)
7ct Diamond Round (12.43×12.43mm)
40ct Apatite Round (22.02×22.02mm)
Difference: 214% (259.47 mm²)
40ct Apatite (Round, 22.02×22.02mm) has approx. 214% more face-up area than 7ct Diamond (Round, 12.43×12.43mm). In other words, it's 3.14x larger.


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