Jewellery

From CrawlWiki

Jewellery in Crawl consists of rings or amulets. A character can only equip a single amulet and two rings. Jewellery will always be magical, with some effect, good or bad.

Rings and amulets are used by 'p'utting them. You can't put a ring while berserking or if you're already wearing two rings or a cursed pair of gloves. You can't put an amulet while berserking or if you're already wearing an amulet. Most rings found in the dungeon have 2% chance of being cursed, 21% for rings of slaying, 22% for rings of protection, strength, evasion, dexterity and intelligence (usually those with negative bonus), and 100% for rings of hunger and teleportation, so unidentified cursed rings are usually bad.

Most amulets are uncursed (98%), and this is independent from their nature (amulets of inaccuracy aren't cursed more often than other amulets).