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1.23ct Diamond (Emerald, 7.16×5.3mm, White) vs 9ct Topaz (Round, 12.96×12.96mm, Blue)


Quick summary: When looked from above (face-up position), 9ct Topaz (12.96×12.96mm, round cut) appears 3.7 times larger than 1.23ct Diamond (7.16×5.3mm, emerald cut). See below how they compare side-by-side on a ring and finger.

1.23ct Diamond (emerald cut)
vs
 9ct Topaz (round cut)
white
 
blue
7.16×5.3 mm 12.96×12.96 mm
actual size
Actual size of 1.23ct Diamond (emerald cut, 7.16×5.3mm, White color)   Actual size of 9ct Topaz (round cut, 12.96×12.96mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 1.23ct Diamond (emerald cut, 7.16×5.3mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 9ct Topaz (round cut, 12.96×12.96mm) 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
 32% vs 77%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 1.23ct Diamond Emerald (7.16×5.3mm, White) and 9ct Topaz Round (12.96×12.96mm, Blue) 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.


1.23 Ct Diamond (Emerald) 9 Ct Topaz (Round)
7.16×5.3 mm vs 12.96×12.96 mm
35.29 mm²   131.92 mm²
Face-up size outline for 9ct Topaz (12.96×12.96mm, round cut)
Face-up size outline for 1.23ct Diamond (7.16×5.3mm, emerald cut)
1.23ct Diamond Emerald (7.16×5.3mm)
9ct Topaz Round (12.96×12.96mm)
Difference: 274% (96.63 mm²)
9ct Topaz (Round, 12.96×12.96mm) has approx. 274% more face-up area than 1.23ct Diamond (Emerald, 7.16×5.3mm). In other words, it's 3.74x larger.


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