GIA's Gübelin Gem Project: Spinel
Found in nearly every colour – most notably red, pink and blue – spinels are popular gemstones because of their abundance, moderate cost and attractiveness.
Gems and Minerals from the Sub-Arctic
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.