4ct Spinel (Princess, 8.64×8.64mm, Red) vs 4ct Alexandrite (Princess, 8.53×8.53mm, Bluish Green)
Quick summary: When looked from above (face-up position), 4ct Spinel (8.64×8.64mm, princess cut) appears 3% larger than 4ct Alexandrite (8.53×8.53mm, princess cut). See below how they compare side-by-side on a ring and finger.
| 4ct Spinel (princess cut) |
vs
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4ct Alexandrite (princess cut) |
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red |
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| 8.64×8.64 mm | 8.53×8.53 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 Princess (8.64×8.64mm, Red)
and
4ct Alexandrite Princess (8.53×8.53mm, 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 (Princess) | 4 Ct Alexandrite (Princess) | |
| 8.64×8.64 mm | vs | 8.53×8.53 mm |
| 74.65 mm² | 72.76 mm² |
| 4ct Spinel Princess (8.64×8.64mm) | |
| 4ct Alexandrite Princess (8.53×8.53mm) | |
| Difference: 3% (1.89 mm²) |
4ct Spinel (Princess, 8.64×8.64mm) has approx. 3% more face-up area than 4ct Alexandrite (Princess, 8.53×8.53mm).
Popular comparisons:
- 2ct Spinel (Princess, Gray, 7.01 x 7.01) vs. 2ct Diamond (Cushion, White, 7.34 x 7.34)
- 1ct Spinel (Princess, Red, 5.57 x 5.57) vs. 1ct Sapphire (Princess, Blue, 5.37 x 5.37)
- 2ct Spinel (Princess, Gray, 7.01 x 7.01) vs. 2ct Spinel (Cushion, Gray, 7.3 x 7.3)
- 40ct Spinel (Princess, Red, 19.04 x 19.04) vs. 40ct Spinel (Emerald, Red, 22.61 x 16.75)
- 0.5ct Spinel (Princess, Red, 4.42 x 4.42) vs. 0.5ct Diamond (Round, White, 5.16 x 5.16)
- 1ct Spinel (Princess, Red, 5.57 x 5.57) vs. 1ct Diamond (Princess, White, 5.51 x 5.51)
- 5ct Spinel (Princess, Blue, 9.52 x 9.52) vs. 5ct Sapphire (Cushion, Blue, 9.56 x 9.56)
- 4ct Spinel (Princess, Blue, 8.84 x 8.84) vs. 5ct Sapphire (Princess, Blue, 9.19 x 9.19)
- 2.45ct Spinel (Princess, Gray, 7.5 x 7.5) vs. 1ct Diamond (Round, White, 6.5 x 6.5)