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2.5ct Topaz (Emerald, 9.03×6.69mm, Blue) vs 2ct Diamond (Round, 8.19×8.19mm, White)


Quick summary: When looked from above (face-up position), 2.5ct Topaz (9.03×6.69mm, emerald cut) appears 7% larger than 2ct Diamond (8.19×8.19mm, round cut). See below how they compare side-by-side on a ring and finger.

2.5ct Topaz (emerald cut)
vs
 2ct Diamond (round cut)
blue
 
white
9.03×6.69 mm 8.19×8.19 mm
actual size
Actual size of 2.5ct Topaz (emerald cut, 9.03×6.69mm, Blue 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
Blue 2.5ct Topaz (emerald cut, 9.03×6.69mm) 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
 40% vs 49%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 2.5ct Topaz Emerald (9.03×6.69mm, Blue) 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, Topaz will face-up slightly smaller than Diamond for a given carat weight, because it has higher specific gravity (3.53 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.


2.5 Ct Topaz (Emerald) 2 Ct Diamond (Round)
9.03×6.69 mm vs 8.19×8.19 mm
56.18 mm²   52.68 mm²
Face-up size outline for 2.5ct Topaz (9.03×6.69mm, emerald cut)
Face-up size outline for 2ct Diamond (8.19×8.19mm, round cut)
2.5ct Topaz Emerald (9.03×6.69mm)
2ct Diamond Round (8.19×8.19mm)
Difference: 7% (3.5 mm²)
2.5ct Topaz (Emerald, 9.03×6.69mm) has approx. 7% more face-up area than 2ct Diamond (Round, 8.19×8.19mm).


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