×
carat vs. color  length*  width*
  ×

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

40ct Diamond (Oval, 27.75×18.5mm, White) vs 40ct Emerald (Oval, 29.82×19.88mm, Green)


Quick summary: When looked from above (face-up position), 40ct Emerald (29.82×19.88mm, oval cut) appears 15% larger than 40ct Diamond (27.75×18.5mm, oval cut). See below how they compare side-by-side on a ring and finger.

40ct Diamond (oval cut)
vs
 40ct Emerald (oval cut)
white
 
green
27.75×18.5 mm 29.82×19.88 mm
actual size
Actual size of 40ct Diamond (oval cut, 27.75×18.5mm, White color)   Actual size of 40ct Emerald (oval cut, 29.82×19.88mm, Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 40ct Diamond (oval cut, 27.75×18.5mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 40ct Emerald (oval cut, 29.82×19.88mm) 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
 110% vs 118%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 40ct Diamond Oval (27.75×18.5mm, White) and 40ct Emerald Oval (29.82×19.88mm, Green) 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 Emerald for a given carat weight, because it has higher specific gravity (3.52 vs. 2.72 - this means it's "heavier" compared to Emerald 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.


40 Ct Diamond (Oval) 40 Ct Emerald (Oval)
27.75×18.5 mm vs 29.82×19.88 mm
420.97 mm²   486.11 mm²
Face-up size outline for 40ct Emerald (29.82×19.88mm, oval cut)
Face-up size outline for 40ct Diamond (27.75×18.5mm, oval cut)
40ct Diamond Oval (27.75×18.5mm)
40ct Emerald Oval (29.82×19.88mm)
Difference: 15% (65.14 mm²)
40ct Emerald (Oval, 29.82×19.88mm) has approx. 15% more face-up area than 40ct Diamond (Oval, 27.75×18.5mm).


Popular comparisons: