2.5ct Topaz (Cushion, 7.91×7.91mm, Blue) vs 2ct Diamond (Round, 8.19×8.19mm, White)
Quick summary: When looked from above (face-up position), 2.5ct Topaz (7.91×7.91mm, cushion 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 (cushion cut) |
vs
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2ct Diamond (round cut) |
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blue |
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| 7.91×7.91 mm | 8.19×8.19 mm | |
| actual size | ||
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Actual size is set for screen
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Ring:
Skin tone:
Ring width: 3.0 mm
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64 mm |
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Actual sizes of
2.5ct Topaz Cushion (7.91×7.91mm, 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.
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) | 2 Ct Diamond (Round) | |
| 7.91×7.91 mm | vs | 8.19×8.19 mm |
| 56.31 mm² | 52.68 mm² |
| 2.5ct Topaz Cushion (7.91×7.91mm) | |
| 2ct Diamond Round (8.19×8.19mm) | |
| Difference: 7% (3.63 mm²) |
2.5ct Topaz (Cushion, 7.91×7.91mm) has approx. 7% more face-up area than 2ct Diamond (Round, 8.19×8.19mm).
Popular comparisons:
- 2.5ct Topaz (Cushion, Blue, 7.91 x 7.91) vs. 1.2ct Topaz (Cushion, Blue, 6.19 x 6.19)
- 2.5ct Topaz (Cushion, Blue, 7.91 x 7.91) vs. 1.5ct Diamond (Round, White, 7.44 x 7.44)
- 4ct Topaz (Cushion, Blue, 10 x 10) vs. 4ct Topaz (Round, Blue, 11 x 11)
- 28ct Topaz (Cushion, Blue, 17.7 x 17.7) vs. 28ct Diamond (Cushion, White, 17.69 x 17.69)
- 4ct Topaz (Cushion, Bluish Green, 9.25 x 9.25) vs. 7ct Topaz (Cushion, Bluish Green, 11.15 x 11.15)
- 2ct Topaz (Cushion, Light Bluish Green, 7.34 x 7.34) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 2.5ct Topaz (Cushion, Dark Violet, 7.91 x 7.91) vs. 1.5ct Diamond (Round, White, 7.44 x 7.44)
- 4.9ct Topaz (Cushion, Blue, 9.9 x 9.9) vs. 3.66ct Amethyst (Cushion, Violet, 9.88 x 9.88)