1.8ct Alexandrite (Trillion, 8.77×8.77mm, Dark Purple) vs 1ct Diamond (Round, 6.5×6.5mm, White)
Quick summary: When looked from above (face-up position), 1.8ct Alexandrite (8.77×8.77mm, trillion cut) appears 44% larger than 1ct Diamond (6.5×6.5mm, round cut). See below how they compare side-by-side on a ring and finger.
| 1.8ct Alexandrite (trillion cut) |
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1ct Diamond (round cut) |
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dark purple |
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| 8.77×8.77 mm | 6.5×6.5 mm | |
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Actual sizes of
1.8ct Alexandrite Trillion (8.77×8.77mm, Dark Purple)
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
(3.7 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.
| 1.8 Ct Alexandrite (Trillion) | 1 Ct Diamond (Round) | |
| 8.77×8.77 mm | vs | 6.5×6.5 mm |
| 47.69 mm² | 33.18 mm² |
| 1.8ct Alexandrite Trillion (8.77×8.77mm) | |
| 1ct Diamond Round (6.5×6.5mm) | |
| Difference: 44% (14.51 mm²) |
1.8ct Alexandrite Trillion (8.77×8.77mm) has approx. 44% more face-up area than 1ct Diamond Round (6.5×6.5mm).
Popular comparisons:
- 0.75ct Alexandrite (Trillion, Bluish Green, 6.55 x 6.55) vs. 0.87ct Diamond (Round, White, 6.21 x 6.21)
- 1ct Alexandrite (Trillion, Bluish Green, 7.21 x 7.21) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Alexandrite (Trillion, Bluish Green, 8 x 8) vs. 1ct Alexandrite (Pear, Bluish Green, 9 x 6)
- 5.5ct Alexandrite (Trillion, Bluish Green, 12.73 x 12.73) vs. 8.5ct Alexandrite (Oval, Bluish Green, 15.84 x 10.56)
- 1ct Alexandrite (Trillion, Bluish Green, 7.21 x 7.21) vs. 1ct Diamond (Trillion, White, 7.74 x 7.74)
- 1ct Alexandrite (Trillion, Green, 6.4 x 6.5) vs. 1.75ct Emerald (Emerald, Green, 8.78 x 6.5)
- 12ct Alexandrite (Trillion, Bluish Green, 16.52 x 16.52) vs. 1ct Alexandrite (Emerald, Bluish Green, 6.55 x 4.85)
- 1ct Alexandrite (Trillion, Bluish Green, 7.21 x 7.21) vs. 1ct Emerald (Trillion, Green, 8.01 x 8.01)
Enter your screen size (diagonal)
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Actual size is currently adjusted to screen.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a gem, ring and finger will not be shown correctly.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a gem, ring and finger will not be shown correctly.