40ct Diaspore (Oval, 27.68×18.45mm, Light Yellowish Green) vs 40ct Alexandrite (Oval, 26.84×17.89mm, Bluish Green)
Quick summary: When looked from above (face-up position), 40ct Diaspore (27.68×18.45mm, oval cut) appears 6% larger than 40ct Alexandrite (26.84×17.89mm, oval cut). See below how they compare side-by-side on a ring and finger.
| 40ct Diaspore (oval cut) |
vs
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40ct Alexandrite (oval cut) |
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light yellowish green |
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| 27.68×18.45 mm | 26.84×17.89 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
40ct Diaspore Oval (27.68×18.45mm, Light Yellowish Green)
and
40ct Alexandrite Oval (26.84×17.89mm, 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.
| 40 Ct Diaspore (Oval) | 40 Ct Alexandrite (Oval) | |
| 27.68×18.45 mm | vs | 26.84×17.89 mm |
| 418.77 mm² | 393.74 mm² |
| 40ct Diaspore Oval (27.68×18.45mm) | |
| 40ct Alexandrite Oval (26.84×17.89mm) | |
| Difference: 6% (25.03 mm²) |
40ct Diaspore (Oval, 27.68×18.45mm) has approx. 6% more face-up area than 40ct Alexandrite (Oval, 26.84×17.89mm).
Popular comparisons:
- 1ct Diaspore (Oval, Light Yellowish Green, 7.98 x 5.32) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1.8ct Diaspore (Oval, Light Purple, 9.5 x 6.5) vs. 2.3ct Diamond (Oval, White, 10 x 7.14)
- 1ct Diaspore (Oval, Light Yellowish Green, 7.98 x 5.32) vs. 1ct Alexandrite (Oval, Bluish Green, 7.77 x 5.18)
- 7ct Diaspore (Oval, Light Yellowish Green, 15.27 x 10.18) vs. 19ct Emerald (Emerald, Green, 19.43 x 14.39)
- 4.25ct Diaspore (Oval, Light Yellowish Green, 12.93 x 8.62) vs. 2.35ct Diaspore (Oval, Light Yellowish Green, 10.62 x 7.08)
- 0.75ct Diaspore (Oval, Light Yellowish Green, 7.26 x 4.84) vs. 0.5ct Diaspore (Oval, Light Yellowish Green, 6.33 x 4.22)
- 2.5ct Diaspore (Oval, Light Yellowish Green, 9.5 x 7.5) vs. 2.5ct Diamond (Oval, White, 9 x 7)
- 1.8ct Diaspore (Oval, Light Yellowish Green, 9.72 x 6.48) vs. 2.3ct Diamond (Oval, White, 10.71 x 7.14)
- 2.5ct Diaspore (Oval, Light Yellowish Green, 10.83 x 7.22) vs. 2.5ct Diamond (Oval, White, 11.01 x 7.34)