Spessartite garnet.

Spessartite garnet is a gemstone that’s part of the garnet mineral group and is known for its fiery orange color:

• Color

  Spessartite is orange due to its manganese content, but iron can modify the color to be deeper and more reddish. The most sought-after color is a bold, intense orange without any undertones of red, yellow, or brown. 
• Origin

  Spessartite was discovered in the Spessart Mountains of Bavaria, Germany in the 1830s, which is where it gets its name. Today, gem-quality spessartite is also found in Namibia, Tanzania, and Nigeria. 
• Other names

  Spessartite is also known as spessartine, and the bright orange variety is called Mandarin garnet. It’s also sometimes called Fanta garnet because of its brilliant orange color. 
• Properties

  Spessartite has a Mohs hardness of 6.5–7.5, a vitreous (glassy) luster, and a refractive index of 1.79–1.985. It can be transparent to opaque, and has a conchoidal or subconchoidal fracture. 
• Beliefs

  Some believe that spessartite can help with creativity, and that wearing it can spark a sudden burst of creativity.