20ct Benitoite (Emerald, 17.87×13.24mm, Blue) vs 20ct Alexandrite (Emerald, 17.74×13.14mm, Bluish Green)
Quick summary: When looked from above (face-up position), 20ct Benitoite (17.87×13.24mm, emerald cut) appears 1% larger than 20ct Alexandrite (17.74×13.14mm, emerald cut). See below how they compare side-by-side on a ring and finger.
| 20ct Benitoite (emerald cut) |
vs
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20ct Alexandrite (emerald cut) |
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blue |
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| 17.87×13.24 mm | 17.74×13.14 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
20ct Benitoite Emerald (17.87×13.24mm, Blue)
and
20ct Alexandrite Emerald (17.74×13.14mm, 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 slightly smaller than Benitoite for a given
carat weight, because it has higher specific gravity
(3.73 vs. 3.65 - this means it's "slightly heavier" compared to Benitoite 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.
| 20 Ct Benitoite (Emerald) | 20 Ct Alexandrite (Emerald) | |
| 17.87×13.24 mm | vs | 17.74×13.14 mm |
| 220.04 mm² | 216.79 mm² |
| 20ct Benitoite Emerald (17.87×13.24mm) | |
| 20ct Alexandrite Emerald (17.74×13.14mm) | |
| Difference: 1% (3.25 mm²) |
20ct Benitoite (Emerald, 17.87×13.24mm) has approx. 1% more face-up area than 20ct Alexandrite (Emerald, 17.74×13.14mm).
Popular comparisons:
- 1ct Benitoite (Emerald, Dark Blue, 6.59 x 4.88) vs. 1ct Sapphire (Emerald, Blue, 6.39 x 4.73)
- 1ct Benitoite (Emerald, Dark Blue, 6.59 x 4.88) vs. 2ct Sapphire (Round, Blue, 7.53 x 7.53)
- 1ct Benitoite (Emerald, Dark Blue, 6.59 x 4.88) vs. 2ct Sapphire (Baguette, Blue, 8.73 x 5.82)
- 1ct Benitoite (Emerald, Light Blue, 6.59 x 4.88) vs. 1ct Diamond (Emerald, White, 6.68 x 4.95)
- 0.34ct Benitoite (Emerald, Blue, 4.59 x 3.4) vs. 0.9ct Diaspore (Cushion, Red, 5.7 x 5.7)
- 5ct Benitoite (Emerald, Blue, 11.26 x 8.34) vs. 5ct Diamond (Emerald, White, 11.42 x 8.46)
- 1ct Benitoite (Emerald, Dark Blue, 6.59 x 4.88) vs. 1ct Sapphire (Round, Blue, 5.98 x 5.98)
- 1ct Benitoite (Emerald, Dark Blue, 6.59 x 4.88) vs. 2ct Sapphire (Trillion, Blue, 8.86 x 8.86)
- 1ct Benitoite (Emerald, Dark Blue, 6.59 x 4.88) vs. 1.2ct Sapphire (Emerald, Blue, 6.79 x 5.03)