4ct Diamond (Princess, 8.75×8.75mm, White) vs 3ct Sapphire (Oval, 10.91×7.27mm, Blue)
Quick summary: When looked from above (face-up position), 4ct Diamond (8.75×8.75mm, princess cut) appears 18% larger than 3ct Sapphire (10.91×7.27mm, oval cut). See below how they compare side-by-side on a ring and finger.
| 4ct Diamond (princess cut) |
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3ct Sapphire (oval cut) |
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white |
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| 8.75×8.75 mm | 10.91×7.27 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 Diamond Princess (8.75×8.75mm, White)
and
3ct Sapphire Oval (10.91×7.27mm, Blue)
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, Sapphire 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 Diamond (Princess) | 3 Ct Sapphire (Oval) | |
| 8.75×8.75 mm | vs | 10.91×7.27 mm |
| 76.56 mm² | 65.04 mm² |
| 4ct Diamond Princess (8.75×8.75mm) | |
| 3ct Sapphire Oval (10.91×7.27mm) | |
| Difference: 18% (11.52 mm²) |
4ct Diamond (Princess, 8.75×8.75mm) has approx. 18% more face-up area than 3ct Sapphire (Oval, 10.91×7.27mm).
Popular comparisons:
- 4ct Diamond (Princess, White, 8.75 x 8.75) vs. 2.86ct Diamond (Oval, White, 11.52 x 7.68)
- 4ct Diamond (Princess, White, 8.75 x 8.75) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 4ct Diamond (Princess, White, 8.75 x 8.75) vs. 5ct Diamond (Oval, White, 13.88 x 9.25)
- 4ct Diamond (Princess, White, 8.75 x 8.75) vs. 7ct Diamond (Marquise, White, 19.88 x 9.94)
- 4ct Diamond (Princess, White, 8.75 x 8.75) vs. 6.5ct Diamond (Marquise, White, 19.38 x 9.69)
- 4ct Diamond (Princess, White, 8.75 x 8.75) vs. 4ct Diamond (Emerald, White, 10.61 x 7.86)
- 4ct Diamond (Princess, White, 8.75 x 8.75) vs. 3ct Diamond (Emerald, White, 9.64 x 7.14)
- 4ct Diamond (Princess, White, 8.75 x 8.75) vs. 1.8ct Diamond (Princess, White, 6.7 x 6.7)