Sapphire

Sapphire was a rare variety of corundum that occured in the Realms.

Description
Sapphire was found in shades of pale blue to a deep azure. A typical specimen had a base value of 1,000 gp.

Powers
Realmslore held that sapphires increased magical skill and strength and therefore they were used in creating magic blades and items that affected the mind, magical prowess, and the element of air. However, sapphires had a dampening effect on magically induced fear, rage, despair, or insanity and could partially protect the wearer from these effects. When used as a spell component, sapphires ensured the greatest initial effect (usually damage) upon first impact and the longest possible duration.

With proper preparation, which included bathing the item in a mixture containing powdered sapphire, mounting a large whole sapphire of at least 5,000 gp value on an item such as a sword gave a better than 50 percent chance that the enchantment bonus would be increased. This could be done at the initial enchantment of the item or as a way of possibly improving an already enchanted item.