Andar

Andar was the Realms name for andalusite, a durable gemstone that could be facet-cut by a skilled lapidarist to produce translucent "andars" with a green-red or brown-red flash.

Description
This semi-precious stones could be found as small crystals, averaging 0.5 in (13 mm) in diameter, or as tumbled streambed pebbles. A typical stone had a base value of 50 gp.