×
carat vs. color  length*  width*
  ×

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

12ct Spinel (Emerald, 15.15×11.22mm, Dark Red) vs 2ct Diamond (Round, 8.19×8.19mm, White)


Quick summary: When looked from above (face-up position), 12ct Spinel (15.15×11.22mm, emerald cut) appears 3 times larger than 2ct Diamond (8.19×8.19mm, round cut). See below how they compare side-by-side on a ring and finger.

12ct Spinel (emerald cut)
vs
 2ct Diamond (round cut)
dark red
 
white
15.15×11.22 mm 8.19×8.19 mm
actual size
Actual size of 12ct Spinel (emerald cut, 15.15×11.22mm, Dark Red color)   Actual size of 2ct Diamond (round cut, 8.19×8.19mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Dark Red 12ct Spinel (emerald cut, 15.15×11.22mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 2ct Diamond (round cut, 8.19×8.19mm) 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
 67% vs 49%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 12ct Spinel Emerald (15.15×11.22mm, Dark Red) and 2ct Diamond Round (8.19×8.19mm, 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, Spinel will face-up slightly smaller than Diamond for a given carat weight, because it has higher specific gravity (3.6 vs. 3.52 - this means it's "slightly 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.


12 Ct Spinel (Emerald) 2 Ct Diamond (Round)
15.15×11.22 mm vs 8.19×8.19 mm
158.08 mm²   52.68 mm²
Face-up size outline for 12ct Spinel (15.15×11.22mm, emerald cut)
Face-up size outline for 2ct Diamond (8.19×8.19mm, round cut)
12ct Spinel Emerald (15.15×11.22mm)
2ct Diamond Round (8.19×8.19mm)
Difference: 200% (105.4 mm²)
12ct Spinel (Emerald, 15.15×11.22mm) has approx. 200% more face-up area than 2ct Diamond (Round, 8.19×8.19mm). In other words, it's 3x larger.


Popular comparisons: