Reconstituted: The process of reconstituting gemstone consists of pulverizing smaller pieces of stone and/or cast-offs from the grinding process, often into powder form, that are then stabilized and hardened with resins to achieve a natural stone appearance. It has also become the general term now used by the jewelry industry to describe any simulated or manmade gemstone.  Often referred to as "block" gemstone. manmade quartz glass of gemstone quality that mimics the chemical compound found in natural earth formed stones.