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industry. It usually involves a crystal or glass sphere. The question if a crystal ball is required for scrying is pretty commonly considered answered. The general assumption is that you obviously need a crystal ball and the most effective ones are the size of an over turned goldfish bowl. Here's your plot twist: you don't need one.
Scrying with common stones is more likely what happened in antiquity, though rock and cut crystal were valued quite highly. Such things were not as available to the mediums and psychics of antiquity at all social classes. Your hedge witch and cunning man of rural England in the ancient days of yore were more likely to have a well worn and polished pebble that looked like anything you'd pick up out of a river bank than a flawlessly cut, perfectly clear and polished quartz sphere.
The reflective qualities of the polished stone is what makes scrying easier. It can be done with unpolished stones, but it is a bit trickier. That reflective polished side of the stone is what acts as your mirror or bowl of water. You can use the same techniques to look for images in the stone as you would in a mirror or water.
While I'm at it, a mirror would be an excellent scrying tool. A special variety of mirror known as a 'black mirror' is very popular. They are also incredibly simple to make. Take an inexpensive picture frame, coat the back face of the glass with black paint in an even coat or put a piece of black paper behind the glass, reassemble the picture frame, and you have yourself a black mirror. Black is used instead of other colors because it provides higher contrast and makes the reflections easier to see. Other colors could be used if you so desired.