Ornamental stone

• Ruby ___ (gem)
• Rubylike gemstone
• A hard glassy mineral consisting of an oxide of magnesium and aluminum
• Gemstone often passed off as a ruby
• Ruby variety
• Gemstone mined in Sri Lanka

Wikipedia Word definitions in Wikipedia
Spinel is the magnesium aluminium member of the larger spinel group of minerals. It has the formula MgAlO in the cubic crystal system . Its name comes from Latin "spina" (arrow). Balas ruby is an old name for a rose-tinted variety.

WordNet Word definitions in WordNet
n. a hard glassy mineral consisting of an oxide of magnesium and aluminum; occurs in various colors that are used as gemstones

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Spinel \Spin"el\, n. Bleached yarn in making the linen tape called inkle; unwrought inkle. --Knight.