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"Diamond Soaks" for Separating Precious Metals from Precious Stones: Are There Any New and Efficient Methods Better Thank Aqua Regia Then Sieve Shakers? This is a process for recycling by separating precious stones from gold, silver, the platinum group metals and the base metals alloyed into the precious metals by way of dissolving the metals and leaving the stones undamaged. The standard process used aqua regia and the problem is that the stones remain in the bottom of the reactor with the insoluble consisting of silver chloride, undissolved metals (rhodium for example) and other insoluble (usually pieces of enamel used in decorating the jewelry, etc.).
Sieve shakers will separate the stones from fine particles of insoluble, but many larger pieces of insoluble remain with the stones. We are milling this in jar mills with ceramic grinding media, but the cutlets of many stones are damaged in this process hence I seek a better way.