Ring of wealth

A Ring of wealth can be made by enchanting a dragonstone ring with the spell Enchant Level 5 Jewellery. The Ring of Wealth increases the chance of its wearer getting rare or good item drops from monster drops.This has been tested to have a greater chance to get more coins when pickpocting

While Jagex does not often give out details, it was stated in one issue of the God Letters called Guthix Ponders that monster drops are determined by a random spin on a "wheel". When you kill a monster, it rolls the first  "wheels." If it lands on "rare item," it rolls another wheel that determines what rare item it will be. The Ring of Wealth increases the chance of getting a better (more valuable) rare.

The Ring of Wealth does not increase the chance of getting a clue scroll from any monster, and this has been confirmed multiple times