If you test it yourself, the easiest way is to burn it (gold shop masters can do it, if the jewelry contains iridium).

Because iridium will combine with oxygen in the air to produce oxidation reaction, gold bars with insufficient purity will turn gray; And pure gold will appear bright red after being baked by fire. However, this method may cause some damage to jewelry, but it can be avoided as long as the temperature is paid attention to. )

The accuracy of methods such as density is too low.

You can also go to the testing station and use a chromatograph (very expensive machines, hundreds of thousands, some hundreds of thousands, generally not in gold shops. ) detection. Chromatograph has fast detection speed and no damage to jewelry.

Also, when buying jewelry, you should choose a regular store, because all jewelry needs to be tested at the testing station when labeling. One or dozens of tablets are placed on the chromatograph. As long as one item is not up to standard, it will not be labeled. We should find out which one is not up to standard. Are strictly tested.

Pure gold: gold content ≥99%

Thousands of pure gold: gold content ≥99.9%.

All gold: gold content ≥99.99%.

Handmade. . . .