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My attempt at replicating the Three headed Dragon buckle/brooch that a select few of Dany's cohorts wear in Season 7. I have the shop item set to stainless steel as default, but you can switch it to plastics for a cheaper option.
As printed, the buckle will be 3 inches across. I've printed a couple of items in white polished plastic now, and the middle bar should be pretty sturdy.
I recommend lightly spray painting/priming in matte black, then going over it in flake silver paint or silver/pewter rub n' buff. Chrome spray paint would also work. If you want to do some weathering, go over with a dry brush black acrylic paint and get it down in all the corners. Seal to prevent paint from rubbing off on clothing. To make a pin, cut the bar at either end.