1ct Alexandrite (Oval, 7.77×5.18mm, Bluish Green) vs 1ct Diamond (Round, 6.5×6.5mm, White)
Quick summary: When looked from above (face-up position), 1ct Diamond (6.5×6.5mm, round cut) appears 0.5% larger than 1ct Alexandrite (7.77×5.18mm, oval cut). See below how they compare side-by-side on a ring and finger.
| 1ct Alexandrite (oval cut) |
vs
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1ct Diamond (round cut) |
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bluish green |
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| 7.77×5.18 mm | 6.5×6.5 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
1ct Alexandrite Oval (7.77×5.18mm, Bluish Green)
and
1ct Diamond Round (6.5×6.5mm, White)
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 Diamond for a given
carat weight, because it has higher specific gravity
(3.73 vs. 3.52 - this means it's "heavier" compared to Diamond 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.
| 1 Ct Alexandrite (Oval) | 1 Ct Diamond (Round) | |
| 7.77×5.18 mm | vs | 6.5×6.5 mm |
| 33 mm² | 33.18 mm² |
| 1ct Alexandrite Oval (7.77×5.18mm) | |
| 1ct Diamond Round (6.5×6.5mm) | |
| Difference: 0.5% (0.18 mm²) |
1ct Diamond (Round, 6.5×6.5mm) has approx. 0.5% more face-up area than 1ct Alexandrite (Oval, 7.77×5.18mm).
Popular comparisons:
- 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)
- 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, 7.77 x 5.18) vs. 1.5ct Alexandrite (Oval, Bluish Green, 8.88 x 5.92)
- 1ct Alexandrite (Oval, Bluish Green, 7.77 x 5.18) vs. 1ct Sapphire (Oval, Blue, 7.56 x 5.04)
- 1ct Alexandrite (Oval, Bluish Green, 7.77 x 5.18) vs. 1ct Alexandrite (Round, Bluish Green, 6.14 x 6.14)
- 1ct Alexandrite (Oval, Bluish Green, 7.77 x 5.18) vs. 1ct Emerald (Pear, Green, 9.46 x 5.7)
- 1ct Alexandrite (Oval, Bluish Green, 7.77 x 5.18) vs. 8ct Tanzanite (Oval, Blue, 16.13 x 10.75)