Best Jewelry Supply occupies Suite 610 of downtown San Diego's Jewelers Exchange at 861 Sixth Avenue, stocking trade-grade tools, testers, and fabrication equipment for the building's bench jewelers and independent goldsmiths. The shop is an authorized Krohn Industries dealer carrying gold, silver, nickel, copper, and rhodium plating solutions — the same Superbrite rhodium and PenPal plating pens relied on by repair specialists like GEMFIX INC elsewhere in the Exchange. Inventory extends to Sparex No. 2 pickling compound, electrocleaner concentrate, precision scales, and stone-setting hand tools covering the full benchwork cycle from casting cleanup through final polish. The supply chain also serves metalworkers beyond the jewelry trade, supporting the kind of small-scale casting and finishing techniques preserved in the craft collections at Mingei International Museum in Balboa Park. Specialized stock includes investment flask burnout supplies, centrifugal casting crucibles, and electronic gold testers calibrated to distinguish 10K through 24K purity in both yellow and white alloy compositions.