noun. A deep violet-red garnet, FeAl₂Si₃O₁₂, found in metamorphic rocks and used as a gemstone.

noun. The common red variety of garnet.

noun. A type of garnet having a deep red color, inclining to purple, with the chemical formula Fe3Al2(SiO4)3.

noun. a deep red garnet consisting of iron aluminum silicate

noun. a purple variety of the ruby spinel

"The so-called almandine garnets of the jeweler are frequently of the almandite class and tend to purplish red."

garnet  ruby spinel  spinel ruby