When sourcing gold bangles, you must distinguish between solid gold, gold-filled, and gold-plated items. For solid gold, verify the karat (e.g., 14K, 18K, or 24K) through hallmarking standards like the Hallmarking Act. Request a XRF (X-ray fluorescence) analysis report from the supplier to ensure the gold content matches the specification. If purchasing gold-plated items, ensure a minimum thickness of 2.5 microns (Vermeil standard) for durability and check that the base metal is lead-free and nickel-free to prevent skin irritation.