Spinel

Alexandrite

Chrysoberyl variety — Tanzania

Amethyst

Quartz (purple) — Tanzania, Zambia, Kenya

Aquamarine

Beryl (blue) — Tanzania, Kenya, Ethiopia

Diamond

DRC (one of Africa's largest by volume), Tanzania (Williamson mine), CAR. Industrial and gem-quality.

Emerald

Beryl (green) — Tanzania, Ethiopia

Garnet

Includes rhodolite, tsavorite — Tanzania, Kenya

Opal

Ethiopia (Welo province) — major global source

Peridot

Tanzania, Kenya

Ruby

Corundum (red) — Tanzania, Kenya, Ethiopia

Sapphire

Corundum (blue/other) — Tanzania, Kenya, Ethiopia

Tanzanite

Blue-violet zoisite — found ONLY at Mererani Hills, Tanzania. Globally unique.

Tourmaline

Multiple colours — Tanzania, Kenya

Zircon (gem quality)

Tanzania