The evidence strongly supports the truthfulness of the statement. Multiple high-authority news sources like Reuters, Bloomberg, and the Wall Street Journal explicitly report on a significant, single-day price drop for precious metals. The language used, such as "plunge," "flash crash," and "unprecedented tumble," is indicative of a price movement of the magnitude mentioned in the statement (greater than 4%). Several sources provide direct access to primary historical data (Investing.com, Bloomberg.com, KITCO), which would allow for the direct verification of the exact percentage change. The existence of these authoritative data sources, combined with the consistent narrative from top-tier financial news outlets, lends high credibility to the claim.While two sources mention a price *rally*, they appear to be reporting on the market conditions immediately preceding the drop, thus providing context for the subsequent volatility rather than directly contradicting the statement. For example, a sharp rally can often trigger a subsequent sharp correction or profit-taking event. The article mentioning record trading volume from CME Group could be associated with either a massive rally or a massive sell-off, as high volume accompanies large price swings in either direction. Given the weight of the other sources reporting a plunge, the evidence points overwhelmingly toward a significant single-day decrease in the prices of both gold and silver.