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2.1ct Diamond (Round, 8.32×8.32mm, White) vs 2.75ct Sapphire (Round, 8.38×8.38mm, Dark Bluish Green)


Quick summary: When looked from above (face-up position), 2.75ct Sapphire (8.38×8.38mm, round cut) appears 1% larger than 2.1ct Diamond (8.32×8.32mm, round cut). See below how they compare side-by-side on a ring and finger.

2.1ct Diamond (round cut)
vs
 2.75ct Sapphire (round cut)
white
 
dark bluish green
8.32×8.32 mm 8.38×8.38 mm
actual size
Actual size of 2.1ct Diamond (round cut, 8.32×8.32mm, White color)   Actual size of 2.75ct Sapphire (round cut, 8.38×8.38mm, Dark Bluish Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 2.1ct Diamond (round cut, 8.32×8.32mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Dark Bluish Green 2.75ct Sapphire (round cut, 8.38×8.38mm) 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
 50% vs 50%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 2.1ct Diamond Round (8.32×8.32mm, White) and 2.75ct Sapphire Round (8.38×8.38mm, Dark Bluish 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, Sapphire will face-up smaller than Diamond for a given carat weight, because it has higher specific gravity (4 vs. 3.52 - this means it's "heavier" compared to Diamond 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.


2.1 Ct Diamond (Round) 2.75 Ct Sapphire (Round)
8.32×8.32 mm vs 8.38×8.38 mm
54.37 mm²   55.15 mm²
Face-up size outline for 2.75ct Sapphire (8.38×8.38mm, round cut)
Face-up size outline for 2.1ct Diamond (8.32×8.32mm, round cut)
2.1ct Diamond Round (8.32×8.32mm)
2.75ct Sapphire Round (8.38×8.38mm)
Difference: 1% (0.78 mm²)
2.75ct Sapphire (Round, 8.38×8.38mm) has approx. 1% more face-up area than 2.1ct Diamond (Round, 8.32×8.32mm).


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