Because the lowly 7-sided die needs some more uses:
1 - Ring of Postponed Finality - If someone wearing this ring is killed, their friends and comrades have 24 hours to heal the wearer to a positive hit point total to restore him / her to life. For example, Dunbar takes a major blow and fallsto -13 HP and should be dead. When wearing this ring the party has 24 hours to heal him to a positive HP total to avoid his true death.
2 - Ring of the Sheep - this ring is cursed and makes the wearer more susceptible to Charm type spells. Suck spells are saved against with a -4 penalty. The wearer of a Ring of the Sheep will never willingly remove it.
3 - Rings of the Assassin - these plain rings come as a matched set. When worn on each hand and touched to each other, a magic garrote forms between the two ring. The garrote in question is treated as a +2 weapon.
4 - Ring of Sanctuary - this ring, when placed on the ground and the command word is said, cast a Sanctuary spell. The ring can be used thus once per day
5 - Ring of the Open Palm - in many ways similar to the above mentioned Rings of the Assassin, the Ring of the Open Palm allows the wearer to treat their ringed hand as if it were a +1 sap. Talk about a painful slap ;)
6 - Tenkar's Ring of the Tankard - never one to be without a proper Tankard of beer, Tenkar's Ring of the Tankard can turn into a 32 oz tankard of cold, fresh beer up to three times per day.
7 - Ring of Undeath - This ring appears to be identical to a Ring of Postponed Finality (and will show as such 75% of the time when researched or magically identified), but instead of preserving the wearer's body it will turn the deceased into a Ghoul 1d7 rounds after the wearer dies.