4ct Spinel (Cabochon, 11.25×7.5mm, Red) vs 4ct Alexandrite (Cabochon, 11.12×7.41mm, Bluish Green)
Quick summary: When looked from above (face-up position), 4ct Spinel (11.25×7.5mm, cabochon cut) appears 2% larger than 4ct Alexandrite (11.12×7.41mm, cabochon cut). See below how they compare side-by-side on a ring and finger.
| 4ct Spinel (cabochon cut) |
vs
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4ct Alexandrite (cabochon cut) |
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red |
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| 11.25×7.5 mm | 11.12×7.41 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 Spinel Cabochon (11.25×7.5mm, Red)
and
4ct Alexandrite Cabochon (11.12×7.41mm, 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.
| 4 Ct Spinel (Cabochon) | 4 Ct Alexandrite (Cabochon) | |
| 11.25×7.5 mm | vs | 11.12×7.41 mm |
| 69.19 mm² | 67.57 mm² |
| 4ct Spinel Cabochon (11.25×7.5mm) | |
| 4ct Alexandrite Cabochon (11.12×7.41mm) | |
| Difference: 2% (1.62 mm²) |
4ct Spinel (Cabochon, 11.25×7.5mm) has approx. 2% more face-up area than 4ct Alexandrite (Cabochon, 11.12×7.41mm).
Popular comparisons:
- 6.7ct Spinel (Cabochon, Red, 13.37 x 8.91) vs. 6.7ct Diamond (Cabochon, White, 13.47 x 8.98)
- 2.45ct Spinel (Cabochon, Gray, 9.56 x 6.37) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 1.6ct Spinel (Cabochon, Red, 8.3 x 5.53) vs. 1.6ct Sapphire (Cabochon, Blue, 8.01 x 5.34)
- 1ct Spinel (Cabochon, Light Red, 7.1 x 4.73) vs. 20ct Emerald (Cabochon, Green, 21.18 x 14.12)
- 5.5ct Spinel (Cabochon, Red, 12.51 x 8.34) vs. 5.5ct Ruby (Cabochon, Red, 12.08 x 8.05)
- 2.08ct Spinel (Cabochon, Gray, 9.05 x 6.03) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 3.9ct Spinel (Cabochon, Red, 11.16 x 7.44) vs. 4ct Diamond (Emerald, White, 10.61 x 7.86)
- 8ct Spinel (Cabochon, Red, 14.18 x 9.45) vs. 8ct Spinel (Oval, Red, 15.68 x 10.45)
- 2.47ct Spinel (Cabochon, Gray, 9.59 x 6.39) vs. 2.47ct Diamond (Cabochon, White, 9.66 x 6.44)