（原标题：黄金史诗级涨跌 有人150万卖房换金狂赚76万 有人追高踏错节奏） 一周之内，市场接连上演历史性暴涨、四十年一遇的暴跌与紧随其后的暴力反弹——1月29日凌晨，伦 敦金现货价格飙升至每盎司5626美元的历史峰值；短短两日后（1月31日），剧情急转直下，纽约商品 交易所黄金期货单日暴跌超10%，收于每盎司4745美元，创下四十年最大单日跌幅；市场惊魂未定，2 月3日，现货黄金又强势反弹，单日涨幅超6%，突破4980美元/盎司，创下2008年以来的最大单日涨 幅。2月4日，金价开盘再度拉升，重破5000美元/盎司关口。 2月2日北京市菜百首饰回购区 记者张欣/摄 这波史诗级行情，是屏幕上不断闪烁的数字，更牵动着无数普通人的财富神经。 21世纪经济报道记者记录了这场波动中的多位持金人。他们的故事不在冰冷的K线图里，而在黄金柜台 前紧攥现金的手中，在银行积存金账户深夜亮起的屏幕前，在年轻人用压岁钱换来的第一块金条上。 这些基于特定时机、性格与运气的个体经历，绝非可复制的投资指南。但其所折射出的市场狂热、人性 抉择与随之而来的风险教训，却值得每一位投资者审视与深思，在动荡的市场环境下，秉持理性远比运 气更为可靠 ...

Core Viewpoint - The implementation of the national standard GB/T 36128-2018 has established clear weight tolerances for jewelry products, aiming to protect consumer rights and ensure fair trading practices in the jewelry market [2][3][4]. Group 1: Background and Implementation of the National Standard - Prior to the introduction of the national standard, consumers faced difficulties in asserting their rights due to a lack of unified weight tolerance standards, leading to widespread issues in the jewelry market [2]. - The GB/T 36128-2018 standard was officially released on May 14, 2018, and came into effect on December 1, 2018, marking the first time a national standard specifically addressed weight tolerances for precious metal jewelry [2][3]. - The standard was developed by authoritative technical institutions to ensure its scientific and practical applicability, covering products weighing up to 200 grams [2][3]. Group 2: Key Provisions of the National Standard - The standard specifies allowable weight deviations for different weight categories of jewelry, such as ±0.002 grams for items weighing ≤1 gram, ±0.004 grams for items between 1 and 10 grams, and ±0.01 grams for items between 10 and 200 grams [3]. - Measurement equipment must meet strict accuracy requirements, with scales for items weighing ≤1 gram needing a precision of 0.1 milligrams, and those for items over 10 grams requiring a precision of at least 1 milligram [3]. Group 3: Current Market Practices and Regulatory Actions - Despite the standard's implementation, some small jewelry stores and online retailers still engage in practices that violate the standard, such as using inaccurate measuring devices and unclear product labeling [4]. - Regulatory authorities have increased market oversight, with instances of fines and penalties imposed on businesses found to be in violation of the weight standards [4]. Group 4: Consumer Guidance - Consumers are advised to follow three steps to protect their rights: check product labels for accurate weight, request on-site measurement with compliant scales, and retain purchase receipts and measurement reports [5]. - Understanding and utilizing the national standard can empower consumers to ensure they receive fair value for their jewelry purchases, thereby enhancing their shopping experience [6].