Why not go to the source who made Orions Belt for the film, and see if She offers replicas. Her name is Heidi Nahser. She worked on both MIB films. She made Orions Belt, Jeebs's bling, Agent K's knife, the Charm Bracelet in MIB 2. She also did the jewlery for Wild Wild West, Master and Commander, and The Patriot.
http://www.heidimetaldesign.com/
If you have the 3D modeling, you can have them made in metal here:
http://www.micromouse.ca/pricing.html