The ring of life is a diamond ring that has been enchanted with Lvl-4 Enchant. While worn, if the wearer is dealt damage and has 10% or less of their Hitpoints remaining, the ring automatically teleports the wearer to their respawn point. The ring crumbles to dust after one use.
The ring is not foolproof, as a player wearing one will still die if they are hit from above 10% of their maximum Hitpoints to zero, and it will not cure poison. Self-inflicted damage, such as guzzling a dwarven rock cake or using a locator orb, can also activate the effect. If it is worn along with a phoenix necklace, the necklace effect will trigger first. In PvP, the Tele Block spell will prevent a player's ring of life from activating. The teleport will work up to level 30 Wilderness, as opposed to the normal limit of level 20 for most jewellery-based teleports below dragonstone.
A ring of life is a reward from the The Lost Tribe quest.
A Defence cape can be worn for the same effect, and does not destroy itself on activation.
- ↑ Manual casting is 3 ticks, auto-casting is 7 ticks
For an exhaustive list of all known sources for this item, see here