Overall resistance to wear and damage, considering both hardness and toughness. Diamonds are the hardest gemstone on earth, but are not the toughest – they have directional hardness.
The Diamond Certification Laboratory of Australia (DCLA)
Diamond Valuation Certification and advice from the Diamond authority in Australia
Overall resistance to wear and damage, considering both hardness and toughness. Diamonds are the hardest gemstone on earth, but are not the toughest – they have directional hardness.