Which type of beryl is considered the rarest?

Red beryl, also known as bixbite, is regarded as the rarest type of beryl. It is a red variety that is significantly less common than other beryl species. Red beryl is found in very limited locations, primarily in the Wah Wah Mountains of Utah, making its occurrence quite extraordinary. The scarcity is due to specific geological conditions required for its formation, which are not commonly met.

In contrast, while emeralds, aquamarines, and heliodor are also valuable and beautiful forms of beryl, they are much more widely available in various locations around the world. Emeralds are prized for their rich green color and are mined in several countries, including Colombia and Brazil. Aquamarine is known for its blue hues and is found in significant quantities in places like Brazil and Nigeria. Heliodor, which has a yellow to golden color, is more accessible as well.

Thus, red beryl stands out not only for its striking color but also for its remarkable rarity, which is why it is considered the rarest type of beryl.