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Loose gemstone

Zoisite - Tanzanite

Every stone is one of a kind. We quote on request - with full detail on origin and treatment.

Details

Carat
1.93 ct
Dimensions
8.8 x 6.5 mm
Cut
Oval Brilliant cut
Shape
Oval
Cutting style
Brilliant cut
Colour
Yale Blue
Treatment
Heated
Origin
Tanzania - Merelani
Stone number
7938
All gemstones
· Mineralogy ·

Tanzanite

Tanzanite fascinates with its unique color range from blue to violet and even purplish tones. Its vivid pleochroic effect makes it one of the most extraordinary gemstones in the world.

6.5 - 7
Mohs hardness
orthorhombic
Crystal system
1.691 - 1.700
Refractive index
Heated
Treatment

Properties

Mineral group
Zoisite
Chemical formula
Ca₂Al₃(SiO₄)₃(OH)
Colorant
vanadium
Crystal system
orthorhombic
Hardness (Mohs)
6.5 - 7
Density
approx. 3.35 g/cm³
Refractive index
1.691 - 1.700
Optical character
anisotropic, biaxial positive
Birefringence
0.008 - 0.013
Dispersion
0.021
Pleochroism
strongly trichroic: blue / violet / burgundy
Fluorescence
inert
Luster
vitreous

Why this stone

Found exclusively in Tanzania, it is among the rarest gemstones in the world. Its color-changing properties make it an icon of modern luxury.

Tradition

Tanzanite symbolizes transformation, inner wisdom, and spiritual awakening. It is said to inspire creativity and expand consciousness.

Care

Tanzanite is considerably softer than corundum and has cleavage: no ultrasonic cleaning, no sudden temperature changes, protect from knocks.