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1 Carat Tanzanite Round (6.37×6.37 mm)

blue
actual size
1ct Tanzanite image - Round, Blue
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Ring width: 3.0 mm
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Finger image
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Blue 1ct Tanzanite on a ring
64 mm
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Ring
Gold
Skin tone
Light
Ring diameter
16.9 mm
Ring width
3.0 mm
Finger length
64 mm
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Ring diameter: 16.9 mm
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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 Tanzanite check what Amazon has to offer. You'll usually find quite a selection from many different vendors. Worth a check. For other high quality gemstones (Rubies, Saphhires, Emeralds) and especially Diamonds, I highly recommend JamesAllen.

Gem Details

Name:
Tanzanite
Mineral Class:
Zoisite
Shape:
Round
Chemical Formula:
Ca2Al3(SiO4)3(OH)
Crystal Structure:
Orthorhombic
Hardness:
6-6.5
Specific Gravity
3.3
Carat weight:
1 ct
Gram weight:
0.2 g (0.0071 ounces)
Points:
100 pts
Length:
6.37 mm
Width:
6.37 mm
Average diameter:
6.37 mm
Est. face-up size:
31.87 mm²
Volume:
60.61 mm³
Length-to-width ratio:
1
Refractive Index:
1.69 - 1.70
Cleavage:
1,1
Luster:
Vitreous
Birefringence:
0.009
Wearability:
Very good
Care Instructions:
gentle wear recommended
Color:
Light Blue Blue Dark Blue
Birthstone:
Tanzanite is a birthstone for the month of December

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