28ct Alexandrite (Oval, 23.84×15.89mm, Bluish Green) vs 28ct Topaz (Oval, 24.27×16.18mm, Blue)
Quick summary: When looked from above (face-up position), 28ct Topaz (24.27×16.18mm, oval cut) appears 4% larger than 28ct Alexandrite (23.84×15.89mm, oval cut). See below how they compare side-by-side on a ring and finger.
| 28ct Alexandrite (oval cut) |
vs
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28ct Topaz (oval cut) |
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bluish green |
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| 23.84×15.89 mm | 24.27×16.18 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 Alexandrite Oval (23.84×15.89mm, Bluish Green)
and
28ct Topaz Oval (24.27×16.18mm, 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.
| 28 Ct Alexandrite (Oval) | 28 Ct Topaz (Oval) | |
| 23.84×15.89 mm | vs | 24.27×16.18 mm |
| 310.63 mm² | 322 mm² |
| 28ct Alexandrite Oval (23.84×15.89mm) | |
| 28ct Topaz Oval (24.27×16.18mm) | |
| Difference: 4% (11.37 mm²) |
28ct Topaz (Oval, 24.27×16.18mm) has approx. 4% more face-up area than 28ct Alexandrite (Oval, 23.84×15.89mm).
Popular comparisons:
- 2ct Alexandrite (Oval, Bluish Green, 9.78 x 6.52) vs. 2ct Alexandrite (Princess, Bluish Green, 6.95 x 6.95)
- 1ct Alexandrite (Oval, Bluish Green, 7.77 x 5.18) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Alexandrite (Oval, Bluish Green, 7.77 x 5.18) vs. 1ct Diamond (Oval, White, 8.12 x 5.41)
- 0.68ct Alexandrite (Oval, Bluish Green, 6.7 x 4.2) vs. 0.83ct Alexandrite (Oval, Bluish Green, 5.8 x 5.2)
- 0.82ct Alexandrite (Oval, Bluish Green, 7.5 x 5) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Alexandrite (Oval, Bluish Green, 7.77 x 5.18) vs. 1ct Emerald (Oval, Green, 8.63 x 5.75)
- 1ct Alexandrite (Oval, Bluish Green, 6.9 x 5.7) vs. 0.59ct Alexandrite (Oval, Bluish Green, 6.4 x 4.7)
- 1.4ct Alexandrite (Oval, Purple, 5.8 x 7.3) vs. 0.2ct Diamond (Round, White, 4 x 4)
- 2ct Alexandrite (Oval, Bluish Green, 9.78 x 6.52) vs. 2ct Diamond (Oval, White, 10.23 x 6.82)