Turquoise Care and Cleaning Guide
Gem and mineral hardness is measured on the Mohs scale. The numbers are based on the relative ease or difficulty with which one mineral can be scratched by another. But the Mohs scale is deceptive. The steps between the minerals are not evenly spaced. For example, diamond is only one number away, but it’s much harder than gems in the corundum family.
Turquoise ranks 5 to 6 on the Mohs scale and its toughness is generally Fair to Good.
Turquoise is generally stable to light, but high heat can cause discolouration and surface damage. It dissolves slowly in hydrochloric acid, and it can be discoloured by chemicals, cosmetics and even skin oils or perspiration.
It’s safe to clean turquoise jewellery with warm, soapy water, but it should never be cleaned with steam or ultrasonic cleaners. Some turquoise is treated to improve its surface appearance. Heat or solvents can damage the treated surfaces.