Why do you need melee diamonds? I mean, you can ask BGD for some since they have some of the nicest I've ever seen, but why do you want to buy melee diamonds.
Oh. Well just take it to a great local jeweler. They'll have the melee or be able to get it in for you. Make sure they have an on site bench and check their credentials well.
But BGD is Brian Gavin Diamonds and maybe, if you ask nicely, they can repair it for you (they don't really do that though).
You do need a local jeweler for things like that. They provide the parts needed for repairs. I wouldn't ask Brian unless it is a ring he made (they aren't a regular jewelry store..they primarily sell diamonds and I would think only make repairs to jewelry they have made). Definitely not worth the shipping expense to send rings long distance for repairs unless it is the maker of the ring.