Bradyboy,
293 years ago the people that made jewelry didnt have the technology that we have today to make perfect pieces of jewelry or stones.They cast alot of items,plus beat it out with a hammer,cut or sawed on it with a file.They polished stones by rubbing them with abrasives like river sand.Sand is mostly quartz and will abrade anything.They also used primitive lapidary wheels to shape and polish gems.lapidaries from Spain to China were using files made with resin and emery.Ancient lapidaries cut flat faces on tablets and scarabs to provide surfaces for engraving, but they did not produce the faceted forms we associate with transparent gems today. Most transparent crystals were merely polished. Since color was their main asset,this was enough.