24ct Alexandrite (Heart, 18.48×18.48mm, Bluish Green) vs 24ct Topaz (Heart, 18.82×18.82mm, Blue)
Quick summary: When looked from above (face-up position), 24ct Topaz (18.82×18.82mm, heart cut) appears 4% larger than 24ct Alexandrite (18.48×18.48mm, heart cut). See below how they compare side-by-side on a ring and finger.
| 24ct Alexandrite (heart cut) |
vs
|
24ct Topaz (heart cut) |
|
bluish green |
|
|
| 18.48×18.48 mm | 18.82×18.82 mm | |
| actual size | ||
|
|
|
|
|
||
Actual size is set for screen
|
Ring:
Skin tone:
Ring width: 3.0 mm
|
|
64 mm |
|
|
|||||||||||||||||
|
|||||||||||||||||||||
Actual sizes of
24ct Alexandrite Heart (18.48×18.48mm, Bluish Green)
and
24ct Topaz Heart (18.82×18.82mm, 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.
| 24 Ct Alexandrite (Heart) | 24 Ct Topaz (Heart) | |
| 18.48×18.48 mm | vs | 18.82×18.82 mm |
| 245.89 mm² | 255.02 mm² |
| 24ct Alexandrite Heart (18.48×18.48mm) | |
| 24ct Topaz Heart (18.82×18.82mm) | |
| Difference: 4% (9.13 mm²) |
24ct Topaz (Heart, 18.82×18.82mm) has approx. 4% more face-up area than 24ct Alexandrite (Heart, 18.48×18.48mm).
Popular comparisons:
- 2.7ct Ruby (Pear, Red, 10 x 7) vs. 3ct Ruby (Emerald, Red, 9 x 7)
- 1.5ct Tourmaline (Round, Light Red, 7.45 x 7.45) vs. 1.5ct Sapphire (Round, Light Blue, 6.84 x 6.84)
- 1ct Kyanite (Oval, Blue, 7.77 x 5.18) vs. 1ct Tanzanite (Oval, Blue, 8.07 x 5.38)
- 1ct Aquamarine (Oval, Light Blue, 8 x 6) vs. 1ct Spinel (Oval, Gray, 8 x 6)
- 1.16ct Diamond (Round, White, 6.82 x 6.85) vs. 1.2ct Diamond (Round, White, 6.82 x 6.86)
- 6ct Morganite (Cushion, Light Red, 12 x 10) vs. 3.5ct Sapphire (Cushion, Blue, 8.49 x 8.49)
- 1ct Sapphire (Baguette, Blue, 6.93 x 4.62) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 1ct Topaz (Round, Blue, 6 x 6) vs. 0.5ct Topaz (Round, Blue, 5 x 5)
- 2ct Zircon (Round, Light Orange, 7.16 x 7.16) vs. 2ct Emerald (Emerald, Dark Green, 9.17 x 6.79)