The Onyx amulet is made by using an Onyx stone and a Gold bar on a Furnace with an Amulet mould in your inventory, or in your toolbelt. 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.
Official meeting point for the product committal is:
World 1 West Varrock Bank
Additional Downloadable Content