RuneScape Classic Wiki
Advertisement
RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Opal
The Old School RuneScape Wiki also has an article on Opal.

An Opal is a semiprecious gem is made by using a chisel on an uncut opal for 15 Crafting experience. It can also be found from level 1 archaeology sites in Digsite. This item is used in the Digsite and Legends' Quests. It has no other use in RuneScape Classic.