0.25ct Tanzanite (Round, 4.02×4.02mm, Blue) vs 0.25ct Topaz (Round, 3.93×3.93mm, Blue)
Quick summary: When looked from above (face-up position), 0.25ct Tanzanite (4.02×4.02mm, round cut) appears 5% larger than 0.25ct Topaz (3.93×3.93mm, round cut). See below how they compare side-by-side on a ring and finger.
| 0.25ct Tanzanite (round cut) |
vs
|
0.25ct Topaz (round cut) |
|
blue |
|
|
| 4.02×4.02 mm | 3.93×3.93 mm | |
| actual size | ||
|
|
|
|
|
||
Actual size is set for screen
|
Ring:
Skin tone:
Ring width: 3.0 mm
|
|
64 mm |
|
|
|||||||||||||||||
|
|||||||||||||||||||||
Actual sizes of
0.25ct Tanzanite Round (4.02×4.02mm, Blue)
and
0.25ct Topaz Round (3.93×3.93mm, 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, Topaz will face-up smaller than Tanzanite for a given
carat weight, because it has higher specific gravity
(3.53 vs. 3.35 - this means it's "heavier" compared to Tanzanite 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.
| 0.25 Ct Tanzanite (Round) | 0.25 Ct Topaz (Round) | |
| 4.02×4.02 mm | vs | 3.93×3.93 mm |
| 12.69 mm² | 12.13 mm² |
| 0.25ct Tanzanite Round (4.02×4.02mm) | |
| 0.25ct Topaz Round (3.93×3.93mm) | |
| Difference: 5% (0.56 mm²) |
0.25ct Tanzanite (Round, 4.02×4.02mm) has approx. 5% more face-up area than 0.25ct Topaz (Round, 3.93×3.93mm).
Popular comparisons:
- 0.25ct Tanzanite (Round, Blue, 4.02 x 4.02) vs. 0.25ct Diamond (Round, White, 4.09 x 4.09)
- 0.25ct Tanzanite (Round, Blue, 4.02 x 4.02) vs. 0.75ct Topaz (Emerald, Bluish Green, 7 x 4.48)
- 0.25ct Tanzanite (Round, Blue, 4.02 x 4.02) vs. 0.75ct Ruby (Oval, Red, 7.5 x 5)
- 0.25ct Tanzanite (Round, Blue, 4.02 x 4.02) vs. 0.5ct Sapphire (Round, Blue, 4.75 x 4.75)
- 0.25ct Tanzanite (Round, Blue, 4.02 x 4.02) vs. 0.75ct Topaz (Round, Blue, 5.66 x 5.66)
- 0.25ct Tanzanite (Round, Blue, 4.02 x 4.02) vs. 0.75ct Topaz (Cushion, Blue, 5.3 x 5.3)
- 0.25ct Tanzanite (Round, Blue, 4.02 x 4.02) vs. 0.75ct Topaz (Emerald, Bluish Green, 6.05 x 4.48)
- 0.25ct Tanzanite (Round, Blue, 4.02 x 4.02) vs. 0.75ct Topaz (Emerald, Light Bluish Green, 7 x 4.48)