AMERICAN GEM SOCIETY - ON BIRTHSTONE RINGS
EXCERPT:
The origin of birthstones is believed to date back to the breastplate of Aaron which contained twelve gemstones representing the twelve tribes of Israel. The current list dates back to 1912 with only one addition since then – the tanzanite was added to December.
There are numerous legends and myths about birthstone healing powers and their therapeutic influence. According to these legends, wearing a gemstone during its assigned month heightened its healing powers. For the full effect, individuals needed to own all twelve and alternate them monthly.
Those of you who have had the experience of trying to find enough information about a member of your family who little is known or remembered about, have probably tried using old photos, looking at the clothing they wore, the hair styles and facial hair, the local architecture, signage, anything at all in the picture to put them in a time and place when that photo was taken. But I just met someone who used jewelry, and because this person had a number of pieces in a semi precious stone, correctly found that these correlated with a birth month!
It's worth a try!