December Birthstone Rings: Topaz and turquoise share the limelight as December's birthstone. Topaz rings are available in several different colors including yellow imperial topaz and sveral shades of blue topaz, each shade having a specific name attributed to it. Turquoise rings find their origins in southwest style jewelry, however, in more recent years those styles have expanded to include high fashion silver rings as a well as selections which are contemporary versions of the original southwest style rings popularized by Native Americans.