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4.5ct Sapphire (Emerald, 10.54×7.81mm, Blue) vs 4.5ct Diamond (Oval, 13.4×8.93mm, White)


Quick summary: When looked from above (face-up position), 4.5ct Diamond (13.4×8.93mm, oval cut) appears 28% larger than 4.5ct Sapphire (10.54×7.81mm, emerald cut). See below how they compare side-by-side on a ring and finger.

4.5ct Sapphire (emerald cut)
vs
 4.5ct Diamond (oval cut)
blue
 
white
10.54×7.81 mm 13.4×8.93 mm
actual size
Actual size of 4.5ct Sapphire (emerald cut, 10.54×7.81mm, Blue color)   Actual size of 4.5ct Diamond (oval cut, 13.4×8.93mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 4.5ct Sapphire (emerald cut, 10.54×7.81mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 4.5ct Diamond (oval cut, 13.4×8.93mm) 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
 47% vs 53%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 4.5ct Sapphire Emerald (10.54×7.81mm, Blue) and 4.5ct Diamond Oval (13.4×8.93mm, 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, 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.


4.5 Ct Sapphire (Emerald) 4.5 Ct Diamond (Oval)
10.54×7.81 mm vs 13.4×8.93 mm
76.56 mm²   98.12 mm²
Face-up size outline for 4.5ct Diamond (13.4×8.93mm, oval cut)
Face-up size outline for 4.5ct Sapphire (10.54×7.81mm, emerald cut)
4.5ct Sapphire Emerald (10.54×7.81mm)
4.5ct Diamond Oval (13.4×8.93mm)
Difference: 28% (21.56 mm²)
4.5ct Diamond (Oval, 13.4×8.93mm) has approx. 28% more face-up area than 4.5ct Sapphire (Emerald, 10.54×7.81mm).


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