Golden rocks obtained by training Herblore are part of the Statue of Rhiannon. Two are required each to complete the statue each time that it is built. Golden rocks may be stored inside a statue collection bag.
Combining unfinished potions with secondary ingredients, including barbarian mixes; making unfinished potions; or by cleaning herbs. It is highly recommended to clean cheap herbs, such as marrentill, while having the statue collection bag in inventory. The Herblore rock can be one of the fastest rocks to obtain by using this method.