Smoky Quartz Necklace with Sterling Silver Clasp This is because it is

This is because it is rarely transparent and does not compare well with other high-quality gems

The most highly prized specimens are excavated from the Bearpaw Formation in Alberta

This tree grows naturally in Central American climates

Tourmaline is a boron silicate mineral that is formed with elements such as aluminum

Smoky Quartz Necklace with Sterling Silver Clasp This is because it isWeight: 0. 65 oz Length: 18 19 in. Specifics: Beaded with Lobster Clasp Smoky Quartz is a brown gray yellow variety of quartz that contains aluminum impurities that are naturally irradiated by the Earth. This is the same process that occurs to form amethyst, but with a different metal. Its name is derived from the German word "quarz" meaning hard. Quartz can form in trigonal or hexagonal crystal systems depending on the temperature during formation.