Onyx

Onyx is a rare volcanic gem with a shiny black lustre which is used in the Crafting skill to make jewellery. There is only one way to obtain Uncut onyx.
 * It can be found in the TzHaar crafting store for 300 000 Tokkul. If you have Karamja gloves 1 or higher, this price is reduced to 260 000 Tokkul.

An uncut onyx requires a Crafting level of 67 to cut, granting 167.5 crafting experience. Though it is occasionally worth more cut than uncut, cutting the onyx in hopes of earning money is not advised because of the extremely low demand for onyx gems.

Members can also use the Fletching skill to cut an onyx into Onyx bolt tips by using a chisel on a 'cut' onyx at level 73 Fletching. Cutting an onyx into bolt tips grants the player 9 experience in the Fletching skill and gives the player 24 Onyx bolt tips, although this practice is highly unrecommended due to the rarity of the gem and the fact that TzHaar-Ket and TzHaar-Xil both drop Onyx bolt tips rather commonly.

Onyx jewellery looks significantly different from jewellery using other gems.

The exchange price of the onyx is based roughly on the price of the easiest way to obtain an onyx, which is to obtain a large number of cheap runes from a shop for 9 gold each, and then sell them for Tokkul using the Karamja gloves. You need approximately 2.3M coins to buy an onyx using this method.