4ct Spinel (Cushion, 9.1×9.1mm, Red) vs 4ct Alexandrite (Cushion, 8.99×8.99mm, Bluish Green)
Quick summary: When looked from above (face-up position), 4ct Spinel (9.1×9.1mm, cushion cut) appears 2% larger than 4ct Alexandrite (8.99×8.99mm, cushion cut). See below how they compare side-by-side on a ring and finger.
| 4ct Spinel (cushion cut) |
vs
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4ct Alexandrite (cushion cut) |
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red |
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| 9.1×9.1 mm | 8.99×8.99 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 Cushion (9.1×9.1mm, Red)
and
4ct Alexandrite Cushion (8.99×8.99mm, 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 (Cushion) | 4 Ct Alexandrite (Cushion) | |
| 9.1×9.1 mm | vs | 8.99×8.99 mm |
| 74.53 mm² | 72.74 mm² |
| 4ct Spinel Cushion (9.1×9.1mm) | |
| 4ct Alexandrite Cushion (8.99×8.99mm) | |
| Difference: 2% (1.79 mm²) |
4ct Spinel (Cushion, 9.1×9.1mm) has approx. 2% more face-up area than 4ct Alexandrite (Cushion, 8.99×8.99mm).
Popular comparisons:
- 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)
- 3ct Spinel (Cushion, Red, 8 x 7) vs. 1.88ct Spinel (Oval, Red, 8.92 x 6.44)
- 6.05ct Spinel (Cushion, Violet, 11.07 x 11.04) vs. 4.99ct Sapphire (Round, Blue, 10.43 x 10.37)