18ct Alexandrite (Pear, 22.81×13.74mm, Bluish Green) vs 18ct Topaz (Pear, 23.24×14mm, Blue)
Quick summary: When looked from above (face-up position), 18ct Topaz (23.24×14mm, pear cut) appears 4% larger than 18ct Alexandrite (22.81×13.74mm, pear cut). See below how they compare side-by-side on a ring and finger.
| 18ct Alexandrite (pear cut) |
vs
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18ct Topaz (pear cut) |
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bluish green |
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| 22.81×13.74 mm | 23.24×14 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
18ct Alexandrite Pear (22.81×13.74mm, Bluish Green)
and
18ct Topaz Pear (23.24×14mm, Blue)
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 Topaz for a given
carat weight, because it has higher specific gravity
(3.73 vs. 3.53 - this means it's "heavier" compared to Topaz 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.
| 18 Ct Alexandrite (Pear) | 18 Ct Topaz (Pear) | |
| 22.81×13.74 mm | vs | 23.24×14 mm |
| 228.79 mm² | 237.51 mm² |
| 18ct Alexandrite Pear (22.81×13.74mm) | |
| 18ct Topaz Pear (23.24×14mm) | |
| Difference: 4% (8.72 mm²) |
18ct Topaz (Pear, 23.24×14mm) has approx. 4% more face-up area than 18ct Alexandrite (Pear, 22.81×13.74mm).
Popular comparisons:
- 1ct Alexandrite (Pear, Bluish Green, 8.52 x 5.13) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 0.42ct Alexandrite (Pear, Dark Purple, 6 x 4) vs. 0.5ct Alexandrite (Pear, Dark Purple, 7 x 5)
- 2ct Alexandrite (Pear, Violet, 11 x 7) vs. 1.54ct Diamond (Oval, Bluish Green, 9.65 x 6.42)
- 4ct Alexandrite (Pear, Bluish Green, 13.53 x 8.15) vs. 2ct Diamond (Oval, White, 10.23 x 6.82)
- 1ct Alexandrite (Pear, Bluish Green, 8.52 x 5.13) vs. 30ct Emerald (Pear, Green, 29.42 x 17.72)
- 1ct Alexandrite (Pear, Bluish Green, 8.52 x 5.13) vs. 3ct Emerald (Pear, Green, 13.66 x 8.23)
- 1ct Alexandrite (Pear, Dark Bluish Green, 7.5 x 6) vs. 1ct Sapphire (Pear, Dark Bluish Green, 7 x 5.6)
- 1ct Alexandrite (Pear, Bluish Green, 9 x 6) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Alexandrite (Pear, Bluish Green, 8 x 5) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)