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2.51ct Sapphire (Emerald, 8.35×6.4mm, Blue) vs 0.45ct Diamond (Round, 5×5mm, White)


Quick summary: When looked from above (face-up position), 2.51ct Sapphire (8.35×6.4mm, emerald cut) appears 2.5 times larger than 0.45ct Diamond (5×5mm, round cut). See below how they compare side-by-side on a ring and finger.

2.51ct Sapphire (emerald cut)
vs
 0.45ct Diamond (round cut)
blue
 
white
8.35×6.4 mm 5×5 mm
actual size
Actual size of 2.51ct Sapphire (emerald cut, 8.35×6.4mm, Blue color)   Actual size of 0.45ct Diamond (round cut, 5×5mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 2.51ct Sapphire (emerald cut, 8.35×6.4mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.45ct Diamond (round cut, 5×5mm) 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
 38% vs 30%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 2.51ct Sapphire Emerald (8.35×6.4mm, Blue) and 0.45ct Diamond Round (5×5mm, 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.


2.51 Ct Sapphire (Emerald) 0.45 Ct Diamond (Round)
8.35×6.4 mm vs 5×5 mm
49.7 mm²   19.63 mm²
Face-up size outline for 2.51ct Sapphire (8.35×6.4mm, emerald cut)
Face-up size outline for 0.45ct Diamond (5×5mm, round cut)
2.51ct Sapphire Emerald (8.35×6.4mm)
0.45ct Diamond Round (5×5mm)
Difference: 153% (30.07 mm²)
2.51ct Sapphire (Emerald, 8.35×6.4mm) has approx. 153% more face-up area than 0.45ct Diamond (Round, 5×5mm). In other words, it's 2.53x larger.


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