×
carat vs. color  length*  width*
  ×

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

7ct Aquamarine (Cushion, 12.19×12.19mm, Light Blue) vs 10ct Diamond (Cushion, 12.55×12.55mm, White)


Quick summary: When looked from above (face-up position), 10ct Diamond (12.55×12.55mm, cushion cut) appears 6% larger than 7ct Aquamarine (12.19×12.19mm, cushion cut). See below how they compare side-by-side on a ring and finger.

7ct Aquamarine (cushion cut)
vs
 10ct Diamond (cushion cut)
light blue
 
white
12.19×12.19 mm 12.55×12.55 mm
actual size
Actual size of 7ct Aquamarine (cushion cut, 12.19×12.19mm, Light Blue color)   Actual size of 10ct Diamond (cushion cut, 12.55×12.55mm, White color)
 
Actual size is set for screen Change
Settings
Ring: Skin tone:
Ring width: 3.0 mm
Saved...
Left finger image
Ring on left finger
Light Blue 7ct Aquamarine (cushion cut, 12.19×12.19mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 10ct Diamond (cushion cut, 12.55×12.55mm) 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
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 7ct Aquamarine Cushion (12.19×12.19mm, Light Blue) and 10ct Diamond Cushion (12.55×12.55mm, 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 Aquamarine for a given carat weight, because it has higher specific gravity (3.52 vs. 2.7 - this means it's "heavier" compared to Aquamarine 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 Aquamarine (Cushion) 10 Ct Diamond (Cushion)
12.19×12.19 mm vs 12.55×12.55 mm
133.74 mm²   141.75 mm²
Face-up size outline for 10ct Diamond (12.55×12.55mm, cushion cut)
Face-up size outline for 7ct Aquamarine (12.19×12.19mm, cushion cut)
7ct Aquamarine Cushion (12.19×12.19mm)
10ct Diamond Cushion (12.55×12.55mm)
Difference: 6% (8.01 mm²)
10ct Diamond Cushion (12.55×12.55mm) has approx. 6% more face-up area than 7ct Aquamarine Cushion (12.19×12.19mm).


Popular comparisons:

Enter your screen size (diagonal)

My screen size is  inches



Actual size is currently adjusted to screen.

If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a gem, ring and finger will not be shown correctly.