Q: I bought a 1.31ct spinel anger. It is beautiful! Read about it on the Internet I found, it is rare, but most stones are enormous and could not put it in a ring, small stones are overpriced. Is it really unusual for a

A: Spinel (MgAl2O4) is a very maligned gem mineral that is often the design of a simulator, because corundum red and blue varieties it may be like ruby or sapphire. However, it is an extraordinary gem in its own right, it is difficult (8), has an intermediate to high RI, shows the advantage of...