Group 1 - The article discusses various methods to identify pure gold versus gold-plated silver, emphasizing the importance of recognizing genuine gold to avoid potential fraud [1][5][7] - Observational methods include examining the color and craftsmanship of the gold item, where pure gold exhibits a bright, uniform yellow hue and smooth surface, while gold-plated silver may appear dull or uneven [1][5] - The article outlines the density method, where pure gold has a density of approximately 19.32 grams per cubic centimeter, and discrepancies in weight can indicate gold-plated silver [5][7] Group 2 - The article mentions the "marking method," where legitimate gold jewelry typically bears stamps like "足金" or "AU999," and the absence of such markings raises suspicion [5] - The sound test is described, where pure gold produces a deep, dull sound when struck, contrasting with the sharper sound of gold-plated silver [5][7] - Chemical testing is highlighted as a method to differentiate gold types, where pure gold does not react with nitric acid, while silver does, indicating the presence of gold-plated silver [7] Group 3 - Professional testing is recommended for accurate identification, suggesting that items be sent to certified jewelry testing institutions for precise analysis using advanced equipment [7] - The article concludes with a reminder from a pawn shop in Chengdu, advising consumers to purchase gold through legitimate channels to ensure authenticity [9]

Core Viewpoint - The article emphasizes the importance of identifying genuine gold amidst rising gold prices and the prevalence of counterfeit products in the market. It provides several methods for consumers to distinguish real gold from fake alternatives. Group 1: Identification Methods - Method 1: Look for the hallmark. All gold jewelry must have a hallmark indicating its material and purity. Different purities have distinct hallmarks, such as Au999 for 99.9% gold, Au750 for 75% gold, and Au585 for 58.5% gold. Markings like 18KRGP indicate gold-plated items with low gold content [3][6]. - Method 2: Use a magnet. Gold is non-magnetic, so using a magnet can help identify counterfeit items that may contain magnetic metals like iron or nickel. If the item is attracted to the magnet, it is likely fake [5][6]. - Method 3: Scratch test with a needle. Gold is soft and can be scratched easily, leaving a gold-colored mark. If a needle glides smoothly and leaves a gold mark, it is genuine; if not, it may be a fake [8][13]. - Method 4: Density test. Gold has a high density of approximately 19.3 g/cm³. By measuring the weight and volume of the gold item, one can calculate its density. A significantly lower density suggests it may be counterfeit [10][11]. - Method 5: Ceramic scratch test. Using an unglazed ceramic surface, scratching the gold should leave a gold mark. If the mark is black or gray, the item is likely not genuine [13].