Water opal

Water opal was a rare and valuable gem stone. They were favored by the deities Deep Sashelas and Savras.

Description
Water opal was a clear to translucent gemstone with small flashes of color. Opals without any color were considered plain hyalite, an inferior stone, and were nearly worthless. Water opal was rare and highly prized for use in decorating mirrors and windows and in the creation of scrying devices such as crystal balls. A typical specimen had a base value of 1,000 gp.

Powers
An elixir of health could be made without any spellcasting by grinding a water opal to powder and mixing it with holy water.

Reputation
Water opals were considered prized gems among the drow. They often used them on their sculptures and scrying crystals.