40ct Ruby (Emerald, 21.84×16.18mm, Red) 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 18% larger than 40ct Ruby (21.84×16.18mm, emerald cut). See below how they compare side-by-side on a ring and finger.
| 40ct Ruby (emerald cut) |
vs
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40ct Diamond (round cut) |
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red |
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| 21.84×16.18 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
40ct Ruby Emerald (21.84×16.18mm, Red)
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
All things being equal, Ruby will face-up smaller than Diamond for a given
carat weight, because it has higher specific gravity
(4 vs. 3.52 - this means it's "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.
| 40 Ct Ruby (Emerald) | 40 Ct Diamond (Round) | |
| 21.84×16.18 mm | vs | 22.23×22.23 mm |
| 328.64 mm² | 388.12 mm² |
| 40ct Ruby Emerald (21.84×16.18mm) | |
| 40ct Diamond Round (22.23×22.23mm) | |
| Difference: 18% (59.48 mm²) |
40ct Diamond (Round, 22.23×22.23mm) has approx. 18% more face-up area than 40ct Ruby (Emerald, 21.84×16.18mm).
Popular comparisons:
- 40ct Ruby (Emerald, Red, 21.84 x 16.18) vs. 0.9ct Diamond (Emerald, White, 6.45 x 4.78)
- 40ct Ruby (Emerald, Red, 21.84 x 16.18) vs. 40ct Sapphire (Cushion, Blue, 19.12 x 19.12)
- 40ct Ruby (Emerald, Red, 21.84 x 16.18) vs. 3ct Sapphire (Emerald, Blue, 9.21 x 6.82)
- 40ct Ruby (Emerald, Red, 21.84 x 16.18) vs. 21ct Emerald (Emerald, Green, 20.09 x 14.88)
- 40ct Ruby (Emerald, Red, 21.84 x 16.18) vs. 40ct Sapphire (Emerald, Blue, 21.84 x 16.18)
- 40ct Ruby (Emerald, Red, 21.84 x 16.18) vs. 40ct Sapphire (Emerald, Blue, 24 x 15)
- 40ct Ruby (Emerald, Red, 21.84 x 16.18) vs. 40ct Sapphire (Emerald, Blue, 24 x 18)
- 40ct Ruby (Emerald, Red, 21.84 x 16.18) vs. 10ct Alexandrite (Cushion, Bluish Green, 12.36 x 12.36)