RuneScape Classic Wiki
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RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Sapphire Amulet (unstrung)
The Old School RuneScape Wiki also has an article on Sapphire Amulet (unstrung).

An unstrung Sapphire Amulet is an incomplete piece of jewellery that can be made with the Crafting skill. It is made by using a gold bar on a furnace while having a amulet mould and a sapphire in the character's inventory. It can be crafted at level 13 and provides 65 experience. In order to wear it, players need to add a string to receive a Sapphire Amulet.