Definition
A blue violet zoisite discovered in Tanzania noted for strong pleochroism.
Key Features
- Hardness about 6 to 7 with fair toughness
- Pleochroic colors can show blue, violet, and burgundy
- Most gems are heated to develop blue violet color
- Often cut to emphasize the desired pleochroic direction
Origin and History
Discovered in the 20th century in Tanzania which remains the primary source.
Buying Guide
Choose vivid blue violet color and protect from hard knocks. Larger sizes show strong color.
- Prefer saturated blue violet without gray or brown
- Consider pendants and earrings to reduce abrasion risk
- Ask for heat treatment disclosure common to most stones
Care and Maintenance
Clean gently with mild soap. Avoid ultrasonic cleaning and sudden temperature changes.
Related Comparisons
FAQs
Why is tanzanite mostly heated
Heating drives off brownish components to reveal blue violet pleochroic colors.
Is tanzanite durable enough for rings
Yes with caution. Protective settings and mindful wear are recommended.
Where does tanzanite come from
Primarily from Tanzania which gives the gem its name.