Various regions in Tanzania, such as Tanga, Songea, and areas near Lake Rukwa, yield beautiful sapphires in hues ranging from blue to yellow, pink, and other fancy colors. Kenyan sapphires, particularly from the John Saul mine, are also highly regarded.

While not as abundant as in Brazil, Paraiba tourmalines with their neon blue-green colors have been found in Mozambique and Tanzania, adding to East Africa's gemstone diversity.

The 2007 discovery of the remarkable Mahenge spinel deposit in Tanzania brought these vibrant red, pink, and orange gemstones into the spotlight, captivating collectors worldwide.

Tanzanite is one of the rarest gemstones on Earth, found exclusively in the Merelani Hills of Tanzania. It exhibits a rich bluish-violet color that is highly prized and unique to this gemstone. Tanzanite's rarity and beauty have made it an iconic gemstone from East Africa.

Tsavorite is a vividly green variety of garnet that was first discovered in Tanzania and Kenya's Tsavo National Park, hence its name. It rivals the finest emeralds in its intense green hue and brilliance. Tsavorite from this region is highly valued by collectors and jewelers.

Tanzania and Kenya are significant sources of high-quality rubies in East Africa. The Winza region in Tanzania has produced exceptional rubies rivaling those from Burma in terms of color saturation. Rubies from Longido in northern Tanzania and Kenya's John Saul mine are also prized.