7.5 Carat Tanzanite (Trillion, 15.18×15.18mm, Blue)
Color:
Actual size is set for screen
How big is a 7.5 carat trillion-cut Tanzanite?
It depends on the cut parameters and length-to-width ratio, but a typical size of a 7.5ct trillion-cut Tanzanite would be around 15.18×15.18 mm (±6%). Check how big it looks on a ring and finger.
Ring:
Skin tone:
|
Ring width:
3.0 mm
|
Saved...
64 mm
| Your settings | |
|---|---|
Ring |
Gold |
Skin tone |
Light |
Ring diameter |
16.9 mm |
Ring width |
3.0 mm |
Finger length |
64 mm |
Finger coverage |
90 % |
|
Saved...
|
|
|
Ring diameter:
16.9 mm
|
Additional Info
Tanzanite is a blue variety of the mineral Zoisite. It got its name after the East African country of Tanzania, were it was discovered in 1967. Most of Tanzanite on the market today is heat treated.
Where to buy?
For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile
Gem Details
|
Name:
|
Tanzanite |
|
Mineral Group:
|
Zoisite |
|
Shape:
|
Trillion |
|
Chemical Formula:
|
Ca2Al3(SiO4)3(OH) |
|
Crystal Structure:
|
Orthorhombic |
|
Hardness:
|
6-6.5 |
|
Specific Gravity
|
3.35 |
|
Carat weight:
|
7.5 ct |
|
Gram weight:
|
1.5 g (0.0529 ounces) |
|
Points:
|
750 pts |
|
Length:
|
15.18 mm |
|
Width:
|
15.18 mm |
|
Est. face-up size:
|
142.87 mm² |
|
Volume:
|
447.76 mm³ |
|
Length-to-width ratio:
|
1 |
|
Refractive Index:
|
1.69 - 1.70 |
|
Luster:
|
Vitreous |
|
Wearability:
|
Very good |
|
Care Instructions:
|
gentle wear recommended |
|
Color:
|
Tanzanite can be found in the following colors:
 
|
|
Birthstone:
|
Tanzanite is a birthstone for the month of December |
Popular comparisons:
- 2ct Tanzanite (Trillion, Blue, 9.44 x 9.44) vs. 1ct Tanzanite (Trillion, Blue, 7.49 x 7.49)
- 1ct Tanzanite (Trillion, Blue, 7.49 x 7.49) vs. 1.5ct Tanzanite (Trillion, Blue, 8.58 x 8.58)
- 2ct Tanzanite (Trillion, Blue, 9.44 x 9.44) vs. 3ct Tanzanite (Trillion, Blue, 10.81 x 10.81)
- 0.7ct Tanzanite (Trillion, Blue, 6 x 6) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 5ct Tanzanite (Trillion, Blue, 12.81 x 12.81) vs. 2.5ct Diamond (Cushion, White, 7.91 x 7.91)
- 2.58ct Tanzanite (Trillion, Blue, 10.28 x 10.28) vs. 3ct Tanzanite (Emerald, Blue, 9.81 x 7.27)
- 1.4ct Tanzanite (Trillion, Blue, 8.38 x 8.38) vs. 1.4ct Tanzanite (Round, Blue, 7.13 x 7.13)
- 1ct Tanzanite (Trillion, Blue, 7.49 x 7.49) vs. 1ct Diamond (Trillion, White, 7.74 x 7.74)
Use the simulator on this page to play around with different ring and finger configurations.