An uncut onyx is the second rarest gem in RuneScape, behind zenyte, and is used in the Crafting skill. Cutting this gem requires 67 Crafting, granting 167.5 Crafting experience. This makes a cut onyx, which can be used to make very powerful jewellery. The cut onyx can also be used with a zenyte shard to create an uncut zenyte.
There is also an extremely small chance (1/2,500,000) of getting it from a bag full of gems, as each bag has 40 gems with each individual one having a 1/100,000,000 chance of being an onyx. The Mor Ul Rek gem stall also has a 1/20,000 chance of yielding an onyx when thieved.
Monster Combat level Quantity Rarity Zulrah 725 1 Skotizo 321 1 Tekton N/A 1