3ct Spinel (Cushion, 8.27×8.27mm, Red) vs 4ct Diamond (Princess, 8.75×8.75mm, White)
Quick summary: When looked from above (face-up position), 4ct Diamond (8.75×8.75mm, princess cut) appears 24% larger than 3ct Spinel (8.27×8.27mm, cushion cut). See below how they compare side-by-side on a ring and finger.
| 3ct Spinel (cushion cut) |
vs
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4ct Diamond (princess cut) |
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red |
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| 8.27×8.27 mm | 8.75×8.75 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
3ct Spinel Cushion (8.27×8.27mm, Red)
and
4ct Diamond Princess (8.75×8.75mm, 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, Spinel will face-up slightly smaller than Diamond for a given
carat weight, because it has higher specific gravity
(3.6 vs. 3.52 - this means it's "slightly 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.
| 3 Ct Spinel (Cushion) | 4 Ct Diamond (Princess) | |
| 8.27×8.27 mm | vs | 8.75×8.75 mm |
| 61.55 mm² | 76.56 mm² |
| 3ct Spinel Cushion (8.27×8.27mm) | |
| 4ct Diamond Princess (8.75×8.75mm) | |
| Difference: 24% (15.01 mm²) |
4ct Diamond (Princess, 8.75×8.75mm) has approx. 24% more face-up area than 3ct Spinel (Cushion, 8.27×8.27mm).
Popular comparisons:
- 3ct Spinel (Cushion, Red, 8.27 x 8.27) vs. 3ct Diamond (Princess, White, 7.95 x 7.95)
- 3ct Spinel (Cushion, Purple, 8 x 7) vs. 1.88ct Spinel (Oval, Violet, 6.44 x 8.92)
- 2.45ct Spinel (Cushion, Gray, 7.81 x 7.81) vs. 0.67ct Diamond (Round, White, 5.69 x 5.69)
- 6.05ct Spinel (Cushion, Violet, 11.07 x 11.04) vs. 6.05ct Sapphire (Cushion, Blue, 10.64 x 9.55)
- 4.33ct Spinel (Cushion, Dark Purple, 11.2 x 8.3) vs. 2.3ct Sapphire (Emerald, Blue, 8.42 x 6.24)
- 1ct Spinel (Cushion, Light Violet, 5.7 x 5.6) vs. 1.35ct Spinel (Cushion, Red, 6.8 x 6.8)
- 8.43ct Spinel (Cushion, Violet, 11.73 x 10.29) vs. 6.05ct Sapphire (Cushion, Blue, 10.64 x 9.55)
- 2.12ct Spinel (Cushion, Gray, 7.44 x 7.44) vs. 0.67ct Diamond (Round, White, 5.69 x 5.69)