1ct Ruby (Round, 5.98×5.98mm, Red) vs 1ct Diamond (Round, 6.5×6.5mm, White)
Quick summary: When looked from above (face-up position), 1ct Diamond (6.5×6.5mm, round cut) appears 18% larger than 1ct Ruby (5.98×5.98mm, round cut). See below how they compare side-by-side on a ring and finger.
| 1ct Ruby (round cut) |
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1ct Diamond (round cut) |
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red |
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| 5.98×5.98 mm | 6.5×6.5 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
1ct Ruby Round (5.98×5.98mm, Red)
and
1ct Diamond Round (6.5×6.5mm, 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.
| 1 Ct Ruby (Round) | 1 Ct Diamond (Round) | |
| 5.98×5.98 mm | vs | 6.5×6.5 mm |
| 28.09 mm² | 33.18 mm² |
| 1ct Ruby Round (5.98×5.98mm) | |
| 1ct Diamond Round (6.5×6.5mm) | |
| Difference: 18% (5.09 mm²) |
1ct Diamond (Round, 6.5×6.5mm) has approx. 18% more face-up area than 1ct Ruby (Round, 5.98×5.98mm).
Popular comparisons:
- 1ct Ruby (Round, Red, 5.98 x 5.98) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Ruby (Round, Red, 5.98 x 5.98) vs. 1ct Tanzanite (Round, Blue, 6.37 x 6.37)
- 1ct Ruby (Round, Red, 5.98 x 5.98) vs. 1.5ct Ruby (Round, Red, 6.84 x 6.84)
- 1ct Ruby (Round, Red, 5.98 x 5.98) vs. 1ct Emerald (Round, Green, 6.82 x 6.82)
- 1ct Ruby (Round, Red, 5.98 x 5.98) vs. 0.5ct Diamond (Round, White, 5.16 x 5.16)
- 1ct Ruby (Round, Red, 5.98 x 5.98) vs. 2.5ct Ruby (Round, Red, 8.11 x 8.11)
- 1ct Ruby (Round, Red, 5.98 x 5.98) vs. 2ct Ruby (Round, Red, 7.53 x 7.53)
- 1ct Ruby (Round, Red, 5.98 x 5.98) vs. 1ct Sapphire (Round, Blue, 5.98 x 5.98)
Use the simulator on this page to play around with different ring and finger configurations.