Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!

Qenya 

miril

noun. shining jewel

A noun in The Etymologies of the 1930s glossed “shining jewel” derived from the root ᴹ√MBIRIL = ᴹ√MIR + ᴹ√RIL (Ety/MBIRIL).

mirilya-

verb. to glitter