They are custom, you cannot purchase them. You can get them anodized yourself which will cost $$. A few years back there were a few of us that found out about a do it yourself method that required TSP (a industrial cleaning powder found at home improvement stores) and upwards of 100 volts of electricity. We wired up a bunch of 9v batteries and had the negative (i think) end in the water/TSP solution with the positive end clipped to the turnbuckle. When you dipped the turnbuckle into the solution a chemical reaction through the electricity would cause the color to change on the turnbuckle. Different voltages produced different colors. I am pretty sure gold was a fairly high amount of voltage. This is not recommended to try!
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