This firm does gold & silver items and I can vouch for their reliability. http://www.centaurdesign.co.uk/contact
He tends to make most stuff through the winter months. I don't think he has clan badges but could probably be persuaded to make one - he made a one-off set of silver buttons for a jacket of mine a couple of years back. Trouble is he is here and you are there but he does a fair bit of mail order. This is the jacket (don't know if it will enlarge) and the gold-plated belt buckle is one of his too.