28ct Diaspore (Cushion, 17.74×17.74mm, Light Yellowish Green) vs 28ct Alexandrite (Cushion, 17.2×17.2mm, Bluish Green)
Quick summary: When looked from above (face-up position), 28ct Diaspore (17.74×17.74mm, cushion cut) appears 6% larger than 28ct Alexandrite (17.2×17.2mm, cushion cut). See below how they compare side-by-side on a ring and finger.
| 28ct Diaspore (cushion cut) |
vs
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28ct Alexandrite (cushion cut) |
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light yellowish green |
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| 17.74×17.74 mm | 17.2×17.2 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
28ct Diaspore Cushion (17.74×17.74mm, Light Yellowish Green)
and
28ct Alexandrite Cushion (17.2×17.2mm, 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 Diaspore for a given
carat weight, because it has higher specific gravity
(3.73 vs. 3.4 - this means it's "heavier" compared to Diaspore 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.
| 28 Ct Diaspore (Cushion) | 28 Ct Alexandrite (Cushion) | |
| 17.74×17.74 mm | vs | 17.2×17.2 mm |
| 283.24 mm² | 266.26 mm² |
| 28ct Diaspore Cushion (17.74×17.74mm) | |
| 28ct Alexandrite Cushion (17.2×17.2mm) | |
| Difference: 6% (16.98 mm²) |
28ct Diaspore (Cushion, 17.74×17.74mm) has approx. 6% more face-up area than 28ct Alexandrite (Cushion, 17.2×17.2mm).
Popular comparisons:
- 2ct Diaspore (Cushion, Light Yellowish Green, 7.44 x 7.44) vs. 0.75ct Spinel (Pear, Red, 7.82 x 4.71)
- 1ct Diaspore (Cushion, Light Yellowish Green, 5.84 x 5.84) vs. 1ct Emerald (Emerald, Green, 7.26 x 5.38)
- 1ct Diaspore (Cushion, Light Yellowish Green, 5.9 x 5.9) vs. 1ct Alexandrite (Oval, Bluish Green, 7.77 x 5.18)
- 1ct Diaspore (Cushion, Light Yellowish Green, 5.9 x 5.9) vs. 1ct Diamond (Cushion, White, 5.83 x 5.83)
- 7ct Diaspore (Cushion, Light Yellowish Green, 11.29 x 11.29) vs. 19ct Emerald (Emerald, Green, 19.43 x 14.39)
- 1ct Diaspore (Cushion, Yellowish Green, 5.84 x 5.84) vs. 1ct Emerald (Emerald, Dark Yellowish Green, 7.26 x 5.38)
- 2.7ct Ruby (Pear, Red, 10 x 7) vs. 3ct Ruby (Emerald, Red, 9 x 7)
- 1.5ct Tourmaline (Round, Light Red, 7.45 x 7.45) vs. 1.5ct Sapphire (Round, Light Blue, 6.84 x 6.84)
- 1ct Kyanite (Oval, Blue, 7.77 x 5.18) vs. 1ct Tanzanite (Oval, Blue, 8.07 x 5.38)