0.21ct Spinel (Cushion, 3.5×2.8mm, Blue) vs 3ct Ruby (Cushion, 8.06×8.06mm, Red)
Quick summary: When looked from above (face-up position), 3ct Ruby (8.06×8.06mm, cushion cut) appears 6.6 times larger than 0.21ct Spinel (3.5×2.8mm, cushion cut). See below how they compare side-by-side on a ring and finger.
| 0.21ct Spinel (cushion cut) |
vs
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3ct Ruby (cushion cut) |
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blue |
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| 3.5×2.8 mm | 8.06×8.06 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
0.21ct Spinel Cushion (3.5×2.8mm, Blue)
and
3ct Ruby Cushion (8.06×8.06mm, Red)
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 Spinel for a given
carat weight, because it has higher specific gravity
(4 vs. 3.6 - this means it's "heavier" compared to Spinel 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.
| 0.21 Ct Spinel (Cushion) | 3 Ct Ruby (Cushion) | |
| 3.5×2.8 mm | vs | 8.06×8.06 mm |
| 8.82 mm² | 58.47 mm² |
| 0.21ct Spinel Cushion (3.5×2.8mm) | |
| 3ct Ruby Cushion (8.06×8.06mm) | |
| Difference: 563% (49.65 mm²) |
3ct Ruby (Cushion, 8.06×8.06mm) has approx. 563% more face-up area than 0.21ct Spinel (Cushion, 3.5×2.8mm). In other words, it's 6.63x larger.
Popular comparisons:
- 0.21ct Spinel (Cushion, Blue, 3.5 x 2.8) vs. 9ct Sapphire (Cabochon, Blue, 14.24 x 9.49)
- 0.21ct Spinel (Cushion, Blue, 3.5 x 2.8) vs. 2ct Emerald (Emerald, Green, 9.17 x 6.79)
- 0.21ct Spinel (Cushion, Blue, 3.5 x 2.8) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 0.21ct Spinel (Cushion, Blue, 3.5 x 2.8) vs. 3ct Sapphire (Emerald, Blue, 9.21 x 6.82)
- 0.21ct Spinel (Cushion, Blue, 3.5 x 2.8) vs. 5ct Chrysoberyl (Cabochon, Light Yellowish Green, 12.02 x 8.01)
- 0.21ct Spinel (Cushion, Blue, 3.5 x 2.8) vs. 4ct Chrysoberyl (Cabochon, Light Yellowish Green, 11.15 x 7.43)
- 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)