Bullion Ring This ring I made the same way, outwards and then inwards, from a one half Troy ounce bullion round from APMEX, exactly as shown in the picture. I made the smallest hole with a pin vice once I got the piece down to about 3/4 an inch diagmeter, and then stretched the tiny hole with first a center punch and then upwards in sizes of O1 steel rods. I have many diameter sizes I got from either Speedy Metals cut to size or in a long round rod from Amazon and I cut myself.