30ct Diamond (Round, 20.2×20.2mm, White) vs 40ct Diamond (Round, 22.23×22.23mm, White)
Quick summary: When looked from above (face-up position), 40ct Diamond (22.23×22.23mm, round cut) appears 21% larger than 30ct Diamond (20.2×20.2mm, round cut). See below how they compare side-by-side on a ring and finger.
| 30ct Diamond (round cut) |
vs
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40ct Diamond (round cut) |
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white |
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| 20.2×20.2 mm | 22.23×22.23 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
30ct Diamond Round (20.2×20.2mm, White)
and
40ct Diamond Round (22.23×22.23mm, 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
The face-up size depends on the shape of the gem, its weight and 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.
| 30 Ct Diamond (Round) | 40 Ct Diamond (Round) | |
| 20.2×20.2 mm | vs | 22.23×22.23 mm |
| 320.47 mm² | 388.12 mm² |
| 30ct Diamond Round (20.2×20.2mm) | |
| 40ct Diamond Round (22.23×22.23mm) | |
| Difference: 21% (67.65 mm²) |
40ct Diamond (Round, 22.23×22.23mm) has approx. 21% more face-up area than 30ct Diamond (Round, 20.2×20.2mm).
Popular comparisons:
- 30ct Diamond (Round, White, 20.2 x 20.2) vs. 1ct Emerald (Round, Green, 6.82 x 6.82)
- 30ct Diamond (Round, White, 20.2 x 20.2) vs. 20ct Diamond (Round, White, 17.64 x 17.64)
- 30ct Diamond (Round, White, 20.2 x 20.2) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 30ct Diamond (Round, White, 20.2 x 20.2) vs. 16ct Diamond (Oval, White, 20.45 x 13.63)
- 30ct Diamond (Round, White, 20.2 x 20.2) vs. 8ct Diamond (Round, White, 13 x 13)
- 30ct Diamond (Round, White, 20.2 x 20.2) vs. 30ct Diamond (Emerald, White, 20.76 x 15.38)
- 30ct Diamond (Round, White, 20.2 x 20.2) vs. 15ct Diamond (Oval, White, 20.01 x 13.34)
- 30ct Diamond (Round, White, 20.2 x 20.2) vs. 0.1ct Diamond (Round, White, 3.02 x 3.02)