GIA Gem Project
Found in nearly every color – most notably red, pink and blue – spinels are popular gemstones because of their abundance, moderate cost and attractiveness.
Gems and Minerals from the Subarctic
Circumnavigate the boreal reaches of the globe to explore gems from polar regions.
Gemstones of Pakistan: Emerald, Ruby, and Spinel
This article reports on three gem materials currently being mined in Pakistan.