Name Jewellery Designs is an American Etsy store which personalises rings & bracelets with names, or short phrases of your choice. It's a straight forward, but unique and thoughtful gift idea. They are stackable, decently priced (under £17 for my Michael ring) and professionally engraved, 204 five out of five star customer reviews can't be wrong.
They have just launched their international shipping service, which is why they reached out to TheWorldofKitsch.com to spread the word. Although turn around and shipping is very fast, I would recommend getting your Christmas present requests in early, as come December I'm sure they'll have a backlog of gifts to engrave.