The birthstone for those born under the zodiac sign Sagittarius is turquoise. Sagittarius, the archer, is the zodiac sign for those born between November 23 and December 21.
Turquoise is the traditional birthstone for December, as well as the sign Sagittarius, and the stone is believed to bring prosperity, success and happiness to those who wear it. Turquoise is the national gemstone of Iran, and the highest quality turquoise comes from that country. It is also found throughout the American Southwest in Colorado, New Mexico, Arizona and California, where it has played an important role in Native American spiritual beliefs for hundreds of years.