Crystal key

The Crystal key is created by combining the tooth half of a key with the loop half of a key. The loop half is much less expensive than the tooth half, with the loop half at 7,365 gp and the tooth being 41,845 gp. It is used to open a chest located in Taverley. The chest is in the long house with some druids, north of the Herblore shop.

The Crystal key can only be used once. After it is used, it disappears. The chest loot always includes an uncut dragonstone and will include another random reward. Possible other rewards include Of these, Spinach roll and 2000 coins are given approximately half the time.
 * Spinach roll and 2000 Coins
 * 50 of each elemental rune (air, earth, fire, and water), 50 mind runes, 50 body runes, and 10 of all the other runes (No blood, astral, or soul runes)
 * 2 cut diamonds and 2 cut rubies
 * Half of a key and 750 Coins
 * 3 Runite bars
 * 100 Coal (noted)
 * 150 Iron ore (noted)
 * Nothing
 * Bones
 * 5 raw swordfish and 1000 coins
 * Rune platelegs
 * Adamant sq shield
 * uncut sapphire 2000 coins spinach roll

It may not be used with the steel key ring as that is used for reusable keys.