Uncut onyx

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.

It can be purchased from TzHaar-Hur-Lek's Ore and Gem Store for 300,000 Tokkul (or 260,000 with the Karamja gloves 1 or better) or received as a rare drop from Zulrah, Skotizo or Tekton.

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.^[1]

Dropping monsters

Monster	Combat level	Quantity	Rarity
Zulrah	725	1	4; Rare (1/512)
Skotizo	321	1	5; Very rare (1/1,000)
Tekton	N/A	1	6; Varies

References