4ct Ruby (Princess, 8.53×8.53mm, Red) vs 3.75ct Diamond (Princess, 8.56×8.56mm, White)
Quick summary: When looked from above (face-up position), 3.75ct Diamond (8.56×8.56mm, princess cut) appears 0.7% larger than 4ct Ruby (8.53×8.53mm, princess cut). See below how they compare side-by-side on a ring and finger.
| 4ct Ruby (princess cut) |
vs
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3.75ct Diamond (princess cut) |
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red |
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| 8.53×8.53 mm | 8.56×8.56 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
4ct Ruby Princess (8.53×8.53mm, Red)
and
3.75ct Diamond Princess (8.56×8.56mm, 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.
| 4 Ct Ruby (Princess) | 3.75 Ct Diamond (Princess) | |
| 8.53×8.53 mm | vs | 8.56×8.56 mm |
| 72.76 mm² | 73.27 mm² |
| 4ct Ruby Princess (8.53×8.53mm) | |
| 3.75ct Diamond Princess (8.56×8.56mm) | |
| Difference: 0.7% (0.51 mm²) |
3.75ct Diamond (Princess, 8.56×8.56mm) has approx. 0.7% more face-up area than 4ct Ruby (Princess, 8.53×8.53mm).
Popular comparisons:
- 4ct Ruby (Princess, Red, 8.53 x 8.53) vs. 2.75ct Diamond (Oval, White, 11.37 x 7.58)
- 4ct Ruby (Princess, Red, 8.53 x 8.53) vs. 2.75ct Diamond (Princess, White, 7.72 x 7.72)
- 4ct Ruby (Princess, Red, 8.53 x 8.53) vs. 4ct Diamond (Princess, White, 8.75 x 8.75)
- 4ct Ruby (Princess, Red, 8.53 x 8.53) vs. 4ct Ruby (Emerald, Red, 10.14 x 7.51)
- 2ct Ruby (Princess, Red, 6.77 x 6.77) vs. 2ct Diamond (Princess, White, 6.94 x 6.94)
- 0.8ct Ruby (Princess, Red, 4.99 x 4.99) vs. 0.9ct Sapphire (Princess, Blue, 5.19 x 5.19)
- 0.27ct Ruby (Princess, Red, 3.5 x 3.5) vs. 0.36ct Ruby (Princess, Red, 4 x 4)
- 0.75ct Ruby (Princess, Red, 4.88 x 4.88) vs. 0.75ct Sapphire (Round, Blue, 5.43 x 5.43)