×
carat vs. color  length*  width*
  ×

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

2.5ct Topaz (Cushion, 7.91×7.91mm, Dark Violet) vs 0.7ct Diamond (Round, 5.77×5.77mm, White)


Quick summary: When looked from above (face-up position), 2.5ct Topaz (7.91×7.91mm, cushion cut) appears 2.2 times larger than 0.7ct Diamond (5.77×5.77mm, round cut). See below how they compare side-by-side on a ring and finger.

2.5ct Topaz (cushion cut)
vs
 0.7ct Diamond (round cut)
dark violet
 
white
7.91×7.91 mm 5.77×5.77 mm
actual size
Actual size of 2.5ct Topaz (cushion cut, 7.91×7.91mm, Dark Violet color)   Actual size of 0.7ct Diamond (round cut, 5.77×5.77mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Dark Violet 2.5ct Topaz (cushion cut, 7.91×7.91mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 0.7ct Diamond (round cut, 5.77×5.77mm) 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
 47% vs 35%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 2.5ct Topaz Cushion (7.91×7.91mm, Dark Violet) and 0.7ct Diamond Round (5.77×5.77mm, 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 (Cushion) 0.7 Ct Diamond (Round)
7.91×7.91 mm vs 5.77×5.77 mm
56.31 mm²   26.15 mm²
Face-up size outline for 2.5ct Topaz (7.91×7.91mm, cushion cut)
Face-up size outline for 0.7ct Diamond (5.77×5.77mm, round cut)
2.5ct Topaz Cushion (7.91×7.91mm)
0.7ct Diamond Round (5.77×5.77mm)
Difference: 115% (30.16 mm²)
2.5ct Topaz (Cushion, 7.91×7.91mm) has approx. 115% more face-up area than 0.7ct Diamond (Round, 5.77×5.77mm). In other words, it's 2.15x larger.


Popular comparisons: