This does not help bitcoins image.
Yes, it would. It would be a conversation starter, to people that not do not know. If someone explains why he wear its and what it is. Persons have first knowledge and can start curiosity and/or when it goes more mainstream they heared about it. The fewest that not are deep into the computer world have ever hear of bitcoin.
So must disagree.
Also, it could be a hybrid between bitcoin bullion/mint that can be used as a neckless for those who want. Also made in silver or gold it could be attractive for collectorsthat saves in this commody.