According to St. Augustus, the Persians first incorporated crystal scrying into their divination practices. Other historians ...credit the Romans for introducing the art to the rest of Europe. Fifth-century texts mention scrying and recommend a variety of stones, including quartz, obsidian and aquamarine.
Find a good-sized crystal that has a nice surface on which to focus your attention. Don’t use leaded crystal; instead, choose genuine quartz crystal for scrying. Set the crystal on a dark cloth, place it on a table in front of you, set it on your altar, or if it is small enough, hold it in the palm of your hand. Think of a question while you gaze at the crystal. Don't look at the surface of the stone; look at a point within it. Let your vision blur, breathe deeply, and keep looking. If clouds, colors, or shapes begin to appear, you're doing it correctly.
Make a mental note of what you see, as well as any ideas that come to you during the process. Continue gazing into the crystal until the images stop. Then interpret them according to the following list or follow your own instincts.
Black clouds: A negative omen, dark times ahead.
Blue clouds: Joy and hope.
Green clouds: Another good omen (a so-called green light).
Purple clouds: Spiritual matters are foremost.
White clouds: A good sign, luck or improved conditions.
Yellow clouds: Unpleasant news.
Clouds moving up and to the right: Yes or go ahead.
Clouds moving down and to the left: No or stop.
Swirling clouds: No definite answer at this time.
This divination method is both quick and highly portable. Nonetheless, it has its limits. Most people do not get detailed responses from scrying; thus, it is usually more suited to simple inquiries than ones requiring in depth information. Be patient with yourself. It takes time and practice to develop this technique.