Quartz is found in abundance from every corner of the earth. In its purest form, quartz is colorless, but is most prized for its purple variety- amethyst. Purple has long been considered a royal color, so it is not surprising that amethyst has been so much in demand throughout history. Fine amethysts are featured in the British Crown Jewels and were also a favorite of Catherine the Great and Egyptian royalty. Great thinkers like Leonardo da Vinci believed that amethyst could dissipate evil thoughts and quicken the intelligence. Get more Info about Amethyst here.
REFRACTIVE INDEX: 1.544 to 1.553
SPECIFIC GRAVITY: 2.66
MOHS HARDNESS: 7
-Source AGTA, GIA