Sadhguru Gems And Jewellers
The Quartz Family
Amethyst, citrine, jasper, agate and aventurine, without the wrong names.
The stones people rename after ruby, emerald and yellow sapphire.
US$25 · ₹2,377
Buy this bookQuartz is one family
Rock crystal, amethyst, citrine, rose quartz, smoky quartz, chalcedony, agate and jasper are quartz materials. They are not corundum and they are not beryl.
Hardness is about 7. That is useful as a teaching fact. It is not a scratch test to perform on a finished jewel.
The rest of the book
3 more chapters, and the PDF with only this shop’s name on it. US$25.
Buy and unlockOriginal notes from Sadhguru Gems And Jewellers. Not a reprint. Not a medical treatment. Not a gem report.