Is there any specific area / street that specializes in jewellery
supplies / display / materials in Tokyo?
Try visiting Okachimachi, you will find suppliers for tools, stones
& precious metal and display materials in various small shops
clustered in this area. You can get there by JR line or by
underground railways. As I live in Tokyo, if the schedule matches,
I'd be happy to spend one afternoon or so to show you around the
If I can be of any help, just let me know by e-mail.