GIA’s laboratories use advanced instrumentation and research to deliver accurate grading, identification, and origin ...

Chalcedonies include many types of cryptocrystalline quartz gems and feature a number of different colors. Geologists can tell a chalcedony from the arrangement and structure of its crystals.

You can find topaz, opals, amethysts, and more — there are over 40 different gemstones possible in every scoop. The larger the container, the more jewels you'll uncover. You can sift your own ...

It is done by influencing the planetary conditions through gemstones. They prefix “Dr.” with their names. Different gemstones are prescribed for patients’ after studying their horoscopes.