Chalcedonies include many types of cryptocrystalline quartz gems and feature a number of different ... and precious minerals such as emeralds—are the most common class of minerals, as well ...

and used in a piece of jewelry. From what you've read, do you think that all gemstones are also birthstones? Well, almost.

Jade is a common gemstone that is popular in jewelry, ornaments, sculptures, and more. While there are two types of jadestone ...