The Onyx amulet is made by using an Onyx stone and a Gold bar on a Furnace with an Amulet mould in your inventory. It requires a Crafting level of 90 and provides 165 experience when made. The amulet must be strung before wearing by using a ball of wool or the String Jewellery spell (Lunar Magicks are required for this spell). Stringing provides 4 Crafting experience.

It is noted that Grum's Gold Exchange in Port Sarim doesn't buy or sell Onyx/Dragonstone rings, necklaces, or amulets; the store only buys/sells jewellery made of Diamond or lower. The Onyx amulet can be enchanted into an Amulet of Fury by members through the use of the Enchant Level 6 Jewellery spell, or Onyx enchant tab made from a Lectern in a Player-owned house. The Assist System can also be used if the player assisting has a Magic level of 87 or higher. However, some users wear the Amulet for showing off how much wealth they have.

Due to market fluctuations, these amulets can sometimes be enchanted and resold for profit. Currently, the difference between the price of the Amulet of fury and the Onyx amulet is -3,610,873 coins.