Tips to spot gold purity

What happened: A guide lists ways to check gold purity, including the BIS hallmark, the HUID code on the BIS Care App, and at-home ceramic streak, vinegar, and skin tests. Key numbers: HUID is a 6-digit alphanumeric code. The vinegar test calls for two to three drops left for about 15 minutes. High purity examples cited are 22K or 24K. Why it matters: The guide states at-home tests only give an indication and cannot guarantee purity, so professional testing is recommended, especially for expensive jewellery whose value depends on actual gold content.

A guide lists ways to check gold purity, including the BIS hallmark, the HUID code on the BIS Care App, and at-home ceramic streak, vinegar, and skin tests.

The guide states at-home tests only give an indication and cannot guarantee purity, so professional testing is recommended, especially for expensive jewellery whose value depends on actual gold content.