Spinel can easily be called history’s most underappreciated gem. For centuries, it was mistaken for ruby in Europe’s crown jewels, such as the Black Prince’s Ruby and the Timur Ruby. Because spinel is frequently found in the same deposits as ruby, it was difficult to distinguish them as separate gemstones for a long time. Now, with modern testing techniques, these two stones are easily identifiable.

Spinel offers a wide range of hues, from orange to intense red, vibrant pink, and all shades of purple, blue, violet, bluish green, and gray.

The Mahenge spinel is famous for its exceptional brilliance and vibrant, intense pink color. GIA described Mahenge spinel as "one of the world’s most desirable colored gemstones."