Why do Disney villains love and wear powerful jewelry/ jewellery?

I have recently been deindexed by Google (please search for sparkling magpie Disney on Google to show them I exist if you see this post). I signed up with a free SEO sit to see how I could fix it (as yet I haven’t and can only be found on Bing). There is an AI post function that I looked at and one suggested post caught my eye - Why do Disney villains love and wear powerful jewelry/ jewellery? 

I haven’t copied and pasted the ai article as it was rubbish but the question got me thinking/ why do Disney villains wear/ hold Jewellery that defines them? 

Ursula’s nautilus gold shell necklace was used to capture Ariel’s voice when she agreed to swap her voice for leg and the pendant was assumed to have magical properties as it glowed when Ursula started certain spells. 

Although Maleficent is portrayed as a heroine, her headpiece with protruding horns adds a devilish  aspect to her personality. 

Jafar’s ruby eyed cobra staff was used to  hypnotise those he wanted to control. An ostentatious piece it made Jafar seem in control, larger than life and EVIL

Certainly the jewellery helps makes the villains  spear more evil. The enchanting world of Snow White is destroyed by the iconic evil Apple, Ursula’s necklace has magical properties etc. On a more consumerist level the villanesque aspect to the jewellery adds to the possibility that they will be licensed and made into wearable pieces, charms, earrings etc. items can be found anywhere from Alliexpress (for a few pence) to more high end websites. I don’t think the original Disney artists envisaged that the villain jewellery would become such a money maker but as the characters’ popularity has increased and viewers want something to remember a movie by, villain jewellery will remain popular.