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Cosmetic prized prismatic pendant was removed from RuneScape after an update, but still exists in-game for those who had obtained it.
[FAQ] • [doc]

A cosmetic prized prismatic pendant is an uncharged prized prismatic pendant. On 1 December 2014, all cosmetic Prized pendants of Skill held by Diango or in a POH toy box were changed into a single cosmetic prized prismatic pendant. Players must select a skill before they can equip the pendant, turning it once again into a cosmetic prized pendant of skill. They may also change the skill without destroying it first.