×
carat vs. color  length*  width*
  ×

(or examine a )
* size in mm (optional)

0.18ct Diamond (Round, 3.67×3.67mm, White) vs 0.66ct Diamond (Round, 5.66×5.66mm, White)


Quick summary: When looked from above (face-up position), 0.66ct Diamond (5.66×5.66mm, round cut) appears 2.4 times larger than 0.18ct Diamond (3.67×3.67mm, round cut). See below how they compare side-by-side on a ring and finger.

0.18ct Diamond (round cut)
vs
 0.66ct Diamond (round cut)
white
 
white
3.67×3.67 mm 5.66×5.66 mm
actual size
Actual size of 0.18ct Diamond (round cut, 3.67×3.67mm, White color)   Actual size of 0.66ct Diamond (round cut, 5.66×5.66mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.18ct Diamond (round cut, 3.67×3.67mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.66ct Diamond (round cut, 5.66×5.66mm) 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
 22% vs 34%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 0.18ct Diamond Round (3.67×3.67mm, White) and 0.66ct Diamond Round (5.66×5.66mm, 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.


0.18 Ct Diamond (Round) 0.66 Ct Diamond (Round)
3.67×3.67 mm vs 5.66×5.66 mm
10.58 mm²   25.16 mm²
Face-up size outline for 0.66ct Diamond (5.66×5.66mm, round cut)
Face-up size outline for 0.18ct Diamond (3.67×3.67mm, round cut)
0.18ct Diamond Round (3.67×3.67mm)
0.66ct Diamond Round (5.66×5.66mm)
Difference: 138% (14.58 mm²)
0.66ct Diamond (Round, 5.66×5.66mm) has approx. 138% more face-up area than 0.18ct Diamond (Round, 3.67×3.67mm). In other words, it's 2.38x larger.


Popular comparisons: