How is benitoite primarily distinguished from other gemstones?

Benitoite is primarily distinguished from other gemstones by its extreme rarity. It is a unique and uncommon mineral, which contributes significantly to its value and appeal in the gemstone market. Benitoite was first discovered in California in the 1900s and is predominantly found in that region, making it highly sought after by collectors.

While the blue color of benitoite is notable and does help differentiate it from many other stones, the distinguishing factor is its rarity, as many other blue gemstones are available in much larger quantities.

Radioactivity is not a characteristic associated with benitoite; in fact, it is non-radioactive. Hardness is also a measurable property of gemstones, but many stones can have similar levels of hardness. Therefore, the extreme rarity of benitoite is the key characteristic that sets it apart in the realm of gemstones.