A loop Half of a key is a rare item drop which may be received from any monster that drops gems. Using it on the tooth half will create a crystal key. Using said key on the Crystal chest in Taverley will give the player several rare items. The chest has a 100% chance of giving an uncut dragonstone, as well as the possibility of various other items, such as coins, runes, and rune bars.
| Source | Level | Quantity |
|---|
| Bandit | 29 | 1 | Very rare (~1/8,192) |
| Barbarian | 16 | 1 | Extremely rare (~1/16,384) |
| Black Demon | 156; 175 | 1 | Rare (~1/651.29) |
| Black Dragon | 200 | 1 | Rare (~1/378.27) |
| Black Heather | 39 | 1 | Very rare (~1/8,192) |
| Black Knight | 46 | 1 | Very rare (~1/5,461.33) |
| Blue Dragon | 105 | 1 | Very rare (~1/3,276.8) |
| Casket | | 1 | Rare (~1/128) |
| Chaos Druid warrior | 44 | 1 | Extremely rare |
| Chaos Druid | 19 | 1 | Extremely rare (~1/16,384) |
| Chaos Dwarf | 59 | 1 | Very rare (~1/5,461.33) |
| Crystal chest | | 1 | Uncommon (~5/128) |
| Donny the lad | 39 | 1 | Very rare (~1/8,192) |
| Dwarf | 18 | 1 | Extremely rare (~1/16,384) |
| Earth warrior | 52 | 1 | Very rare (~1/8,192) |
| Fire Giant | 109 | 1 | Rare (~1/707.54) |
| Giant | 37 | 1 | Very rare (~1/5,461.33) |
| Greater Demon | 87 | 1 | Very rare (~1/3,276.8) |
| Gunthor the Brave | 37 | 1 | Extremely rare (~1/16,384) |
| Hobgoblin | 32; 48 | 1 | Very rare (~1/8,192) |
| Ice Giant | 68 | 1 | Very rare (~1/4,096) |
| Ice queen | 103 | 1 | Very rare (~1/5,461.33) |
| Ice warrior | 57 | 1 | Very rare (~1/5,461.33) |
| Jailer | 51 | 1 | Very rare (~1/5,461.33) |
| Jogre | 58 | 1 | Extremely rare (~1/16,384) |
| King Black Dragon | 245 | 1 | Rare (~1/100.36) |
| Lesser Demon | 79 | 1 | Very rare (~1/4,096) |
| Lord Darquarius | 76 | 1 | Very rare (~1/5,461.33) |
| Moss Giant | 62 | 1 | Very rare (~1/4,096) |
| Mountain Dwarf | 18; 28 | 1 | Extremely rare (~1/16,384) |
| Otherworldly being | 66 | 1 | Very rare (~1/5,461.33) |
| Paladin | 71 | 1 | Very rare (~1/8,192) |
| Pirate | 27; 30 | 1 | Extremely rare (~1/16,384) |
| Rare drop table | | 1 | Rare (~1/128) |
| Red Dragon | 140 | 1 | Very rare (~1/3,276.8) |
| Renegade knight | 51 | 1 | Very rare (~1/5,461.33) |
| Salarin the twisted | 69 | 1 | Extremely rare |
| Shadow Warrior | 64 | 1 | Very rare (~1/2,048) |
| Skeleton | 21; 25; 31; 54 | 1 | Extremely rare (~1/16,384) |
| Speedy Keith | 39 | 1 | Very rare (~1/8,192) |
| Thug | 18 | 1 | Extremely rare (~1/16,384) |
| Tribesman | 39 | 1 | Very rare (~1/8,192) |
| White Knight | 56 | 1 | Extremely rare (~1/16,384) |
| Zombie | 19; 24; 32 | 1 | Extremely rare (~1/16,384) |
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Crystal key