8.5ct Spinel (Emerald, 13.5×10mm, Red) vs 8.5ct Alexandrite (Emerald, 13.34×9.88mm, Bluish Green)
Quick summary: When looked from above (face-up position), 8.5ct Spinel (13.5×10mm, emerald cut) appears 2% larger than 8.5ct Alexandrite (13.34×9.88mm, emerald cut). See below how they compare side-by-side on a ring and finger.
| 8.5ct Spinel (emerald cut) |
vs
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8.5ct Alexandrite (emerald cut) |
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red |
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| 13.5×10 mm | 13.34×9.88 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
8.5ct Spinel Emerald (13.5×10mm, Red)
and
8.5ct Alexandrite Emerald (13.34×9.88mm, Bluish Green)
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, Alexandrite will face-up smaller than Spinel for a given
carat weight, because it has higher specific gravity
(3.73 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.
| 8.5 Ct Spinel (Emerald) | 8.5 Ct Alexandrite (Emerald) | |
| 13.5×10 mm | vs | 13.34×9.88 mm |
| 125.55 mm² | 122.57 mm² |
| 8.5ct Spinel Emerald (13.5×10mm) | |
| 8.5ct Alexandrite Emerald (13.34×9.88mm) | |
| Difference: 2% (2.98 mm²) |
8.5ct Spinel (Emerald, 13.5×10mm) has approx. 2% more face-up area than 8.5ct Alexandrite (Emerald, 13.34×9.88mm).
Popular comparisons:
- 9ct Spinel (Emerald, Red, 13.76 x 10.19) vs. 8ct Diamond (Emerald, White, 13.37 x 9.9)
- 2.35ct Spinel (Emerald, Light Blue, 8.9 x 6.7) vs. 2.35ct Spinel (Emerald, Light Blue, 8.79 x 6.51)
- 1.75ct Spinel (Emerald, Light Brown, 7.97 x 5.9) vs. 1.5ct Diamond (Emerald, White, 7.65 x 5.67)
- 12ct Spinel (Emerald, Dark Red, 15.15 x 11.22) vs. 2ct Diamond (Round, White, 8.19 x 8.19)
- 2ct Spinel (Emerald, Gray, 9.5 x 6.6) vs. 1ct Chrysoberyl (Princess, Yellowish Green, 6 x 6)
- 2.8ct Spinel (Emerald, Red, 9.32 x 6.9) vs. 2.27ct Sapphire (Emerald, Blue, 8.4 x 6.22)
- 20ct Spinel (Emerald, Red, 17.96 x 13.3) vs. 8ct Diamond (Emerald, White, 13.37 x 9.9)
- 3.89ct Spinel (Emerald, Gray, 10.4 x 7.7) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 2ct Spinel (Emerald, Gray, 8.33 x 6.17) vs. 3ct Spinel (Emerald, Gray, 9.54 x 7.07)