×
carat vs. color  length*  width*
  ×

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

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 Change
Settings
Ring: Skin tone:
Ring width: 3.0 mm
Saved...
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
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
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.


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.