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9ct Diamond (Cushion, 12.12×12.12mm, White) vs 30ct Diamond (Cushion, 18.1×18.1mm, White)


Quick summary: When looked from above (face-up position), 30ct Diamond (18.1×18.1mm, cushion cut) appears 2.2 times larger than 9ct Diamond (12.12×12.12mm, cushion cut). See below how they compare side-by-side on a ring and finger.

9ct Diamond (cushion cut)
vs
 30ct Diamond (cushion cut)
white
 
white
12.12×12.12 mm 18.1×18.1 mm
actual size
Actual size of 9ct Diamond (cushion cut, 12.12×12.12mm, White color)   Actual size of 30ct Diamond (cushion cut, 18.1×18.1mm, White color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 9ct Diamond (cushion cut, 12.12×12.12mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 30ct Diamond (cushion cut, 18.1×18.1mm) 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
 72% vs 108%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 9ct Diamond Cushion (12.12×12.12mm, White) and 30ct Diamond Cushion (18.1×18.1mm, 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

The face-up size depends on the shape of the gem, its weight and 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.


9 Ct Diamond (Cushion) 30 Ct Diamond (Cushion)
12.12×12.12 mm vs 18.1×18.1 mm
132.2 mm²   294.85 mm²
Face-up size outline for 30ct Diamond (18.1×18.1mm, cushion cut)
Face-up size outline for 9ct Diamond (12.12×12.12mm, cushion cut)
9ct Diamond Cushion (12.12×12.12mm)
30ct Diamond Cushion (18.1×18.1mm)
Difference: 123% (162.65 mm²)
30ct Diamond (Cushion, 18.1×18.1mm) has approx. 123% more face-up area than 9ct Diamond (Cushion, 12.12×12.12mm). In other words, it's 2.23x larger.


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