Translate

Friday, January 05, 2007

Toughness

1. What is toughness?
Tenacity is defined as toughness. By definition it is a measure of resistance of a gem to breaking or fracturing.

2.What is the relation of hardness and tenacity?
They are not related. Hard stones are not necessarily tough. Diamond, the hardest, cleave while nephrite, which is not hard, is very tough.

No comments: