The Clamorous Opal

Whoever first picks up the Clamorous Opal becomes its owner. Whenever the owner moves, a sound like the rattling of a string of tin cans over cobblestones emanates from his immediate vicinity. The noise makes it impossible for the opal's owner to surprise an enemy, except in extremely loud environments. The opal falls silent only after its owner dies. The owner can not discard or give away the opal. Short of death, the only way to get rid of it is a Remove Curse spell.