Melt-and-Assay (Fire Assay)
Melt-and-Assay (Fire Assay): This conventional technique entails the process of melting a metal sample and isolating it from impurities to accurately assess its purity through chemical analysis. Specific Gravity Test (Relative Density or Water Density Test): In contrast, this method measures an object’s density by comparing its weight in air to its weight when submerged in water..


XRF MACHINE TESTING
This precious metal analysis technique is a non-destructive testing method that employs X-ray technology to assess the composition of metals without causing any damage. It delivers instant results regarding the presence and proportion of different elements within an alloy.


Acid Test (including Touchstone Method)
This method involves applying a small drop of nitric acid to a less visible part of the gold item and observing the reaction. Applying the acid will not cause genuine gold to change color or fizz. On the other hand, non-gold metals or lower-karat gold will react by changing color or fizzing.


Magnetic Test
Since real gold and silver are non-magnetic, a magnet won’t attract them. This property can be a quick and easy way to check if a gold chain is genuine. If you hold a magnet up to a gold chain and it pulls towards the magnet, the chain is likely not made of pure gold or may be gold-plated with a magnetic core.