How to Care for Your Buckle
Your buckle has natural metal colors. I have put a protective beeswax and turpentine coating on it
To keep your buckle glowing softly, occasionally apply my Buckle Butter (a blend of beeswax and turpentine), or a high quality paste wax such as Johnson's, Butcher's, or Renaissance. There are other quality waxes, but I have not used them so I cannot testify to them. But the 4 mentioned here are super waxes.
I suggest that you do not use metal polish on your buckle because it will remove all color.