https://www.cnet.com/news/your-next-smart-necklace-could-unlock-doors-and-shoot-perfume-computex/

The biggest problem with jewellery is it looks pretty, but doesn't do anything. Diamonds might take literally 1 billion years to form, but what have they unlocked for me lately?

That's why we invented smart jewellery. But the biggest problem with smart jewellery is it's designed to be functional and understated -- there's nothing out there for the person who wants more jewels, more unnecessary features and more in-your-face opulence.