Sadhguru Gems And Jewellers
Weight, Hardness and the Safe Tests
Heavy for its size is a clue. A scratch is not a shop trick.
Specific gravity and Mohs hardness, without hazardous liquids and without marking a finished jewel.
US$25 · ₹2,377
Buy this bookSpecific gravity in plain words
Specific gravity, SG, asks whether the stone is heavy for its size. Two stones of the same look can have different weights. Water is the comparison.
SG is the weight of the stone divided by the weight of an equal volume of water. It supports a name. It does not finish one, and it is not a price.
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.