When people talk about precious metals, the first one they think of is gold. While it is a precious metal it is not the only one. In Hatton Garden the specialists are refining such materials as platinum, silver, and ruthenium. This may seem a simple job, but it is in fact a highly skilled trade.
Learning to recover precious metals takes many years of training. If the store is supplying a recycled piece of gold or silver, you can be sure of the quality of product you will be receiving.