Paraiba Tourmaline 3.61cts

PARAIBA TOURMALINE

 

First Discovered in Brazil, Paraiba Tourmalines are among the world's most prized gemstones and are well-known for their intense blue colours, which are brought out by the copper present in them. In fact, Paraiba Tourmalines are set to be the perfect semi-precious stone investment in the near and foreseeable future.

Mohs Scale Hardness

7.0 - 7.5

Specific Gravity

3.06

Birefringence

-0.018 to -0.040

Refractive Index

nω=1.635 - 1.675
nε=1.610 - 1.650