6.5ct Spinel (Marquise, 18.8×9.4mm, Red) vs 6.5ct Alexandrite (Marquise, 18.58×9.29mm, Bluish Green)
Quick summary: When looked from above (face-up position), 6.5ct Spinel (18.8×9.4mm, marquise cut) appears 2% larger than 6.5ct Alexandrite (18.58×9.29mm, marquise cut). See below how they compare side-by-side on a ring and finger.
| 6.5ct Spinel (marquise cut) |
vs
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6.5ct Alexandrite (marquise cut) |
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red |
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| 18.8×9.4 mm | 18.58×9.29 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
6.5ct Spinel Marquise (18.8×9.4mm, Red)
and
6.5ct Alexandrite Marquise (18.58×9.29mm, 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.
| 6.5 Ct Spinel (Marquise) | 6.5 Ct Alexandrite (Marquise) | |
| 18.8×9.4 mm | vs | 18.58×9.29 mm |
| 125.47 mm² | 122.55 mm² |
| 6.5ct Spinel Marquise (18.8×9.4mm) | |
| 6.5ct Alexandrite Marquise (18.58×9.29mm) | |
| Difference: 2% (2.92 mm²) |
6.5ct Spinel (Marquise, 18.8×9.4mm) has approx. 2% more face-up area than 6.5ct Alexandrite (Marquise, 18.58×9.29mm).
Popular comparisons:
- 3ct Spinel (Marquise, Red, 14.74 x 7.37) vs. 3ct Sapphire (Marquise, Blue, 14.24 x 7.12)
- 1.5ct Spinel (Marquise, Red, 11.7 x 5.85) vs. 1.5ct Diamond (Marquise, White, 11.9 x 5.95)
- 2ct Spinel (Marquise, Red, 12.88 x 6.44) vs. 2ct Emerald (Marquise, Green, 14.18 x 7.09)
- 3.7ct Spinel (Marquise, White, 15.2 x 7.3) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 1.1ct Spinel (Marquise, Red, 10.56 x 5.28) vs. 0.38ct Spinel (Round, Red, 4.49 x 4.49)
- 0.15ct Spinel (Marquise, Red, 5.44 x 2.72) vs. 0.05ct Diamond (Round, White, 2.39 x 2.39)
- 1.55ct Spinel (Marquise, Light Purple, 11.84 x 5.92) vs. 2.47ct Kunzite (Princess, Light Purple, 7.84 x 7.84)
- 0.75ct Spinel (Marquise, Light Blue, 9.28 x 4.64) vs. 0.6ct Sapphire (Cushion, Dark Bluish Green, 4.72 x 4.72)
- 5ct Spinel (Marquise, Red, 17.48 x 8.74) vs. 5ct Sapphire (Marquise, Blue, 16.88 x 8.44)