Irtios

Irtios was the common name for danburite in the Realms.

Description
This semi-precious stone was a hard, transparent gemstone that yielded faceted gems of middling size. Irtios were pale yellow or colorless and were found naturally as crystals or water-worn pebbles in stream beds or gravel deposits. These gemstones were often found in sword sheaths and in wizard staves. A typical specimen had a base value of 50 gp.