Jeweled Weapons

Jeweled weapons could be obtained from Thrud in Windemere, but only after joining the Oppression. They appear in Ultima V.

Description
Thrud demanded the password of the Resistance in exchange for them. Despite the high price paid for the weapons, these supposedly fabulous swords turned out to be completely useless in combat.

Trivia

 * Both Ultima Underworld games have jeweled weapons in several varieties (axe, mace and sword). These are apparently unconnected to the ones found in Ultima V, and are very good weapons.