A new gold counterfeiting method using rhenium has been uncovered, causing significant concern in the gold industry. A gold shop in Changxing County, Zhejiang, was defrauded with a necklace that appeared genuine under standard tests but was later found to contain rhenium, a metal with a density similar to gold but a much higher melting point. This technique has been linked to multiple fraud cases across China, with the total value exceeding 800,000 yuan. Rhenium's properties make it difficult to detect with conventional gold testing methods, as its atomic number is close to gold, causing spectrometer signals to overlap. This has led to widespread fraud, with counterfeiters exploiting the high price of gold, now over 1,000 yuan per gram, while rhenium powder costs significantly less. The rise in gold prices has also driven up the price of rhenium, which is primarily used in aerospace applications. Authorities have apprehended key members of a counterfeiting gang, but the challenge remains for the industry to develop more effective detection methods. Current testing equipment in most jewelry stores is inadequate to distinguish between gold and rhenium, posing a significant risk to the integrity of gold transactions.