Chris Martin's Article in Product Reviews

733 Birthstones for Fall and Winter Birthdays
Birthstones may be based on the Zodiac calendar or by the Julian calendar month. There is some overlap between the two. The modern selection of birthstones was developed by the American National Association of Jewelers in 1912. Topaz is most usually found as a yellow stone. There is clear topaz and blue topaz. Clear topaz can be irradiated to become blue.
Posted on Feb-16-2010