Definition
A complex borosilicate gemstone family with an extraordinary color range.
Key Features
- Hardness 7 to 7.5 with good toughness
- Popular varieties include rubellite, indicolite, and Paraíba
- Pleochroism can show different colors from different directions
- Long crystals suit elongated cuts
Origin and History
Sources span Brazil, Nigeria, Mozambique, Afghanistan, and more. Copper bearing Paraíba stones are among the most valuable.
Buying Guide
Select rich color with good clarity and even saturation. Ask about treatments such as heating or clarity enhancement.
- Seek vivid saturation without strong brown or gray
- Confirm copper bearing claims with reputable reports
- Avoid stones with prominent open tubes unless part of the design
Care and Maintenance
Clean with mild soap and water. Avoid strong ultrasonic cleaning for fractured stones.
Related Comparisons
FAQs
What is Paraíba tourmaline
Copper bearing tourmaline with neon blue to green hues originally from Paraíba, Brazil, now also found elsewhere.
Is tourmaline treated
Heat or clarity enhancements can occur and should be disclosed.
Why do some tourmalines look different by angle
Pleochroism causes color to vary with viewing direction.