Birth stones were not discovered ( they all ready existed as gemstones) but instead they were assigned the 12 months of the year to represent that birth month for people who were born during the month.
The first person who discovered stone/rock was The Hunter Gatherers in the stone age.
it must be BC , because later on birth of Jesus Christ (start of AD), the metals were discovered, and there were no stone age remaining on that time.
Jaime Stone's birth name is Jaime Stone.
Mildred Stone's birth name is Mildred I. Stone.
The birth stone for January is Garnet.
Beyonce's birth stone is a sapphire.
the birth stone is Citrine
Dawn Stone's birth name is Andrea Dawn Stone.
Juanita Stone's birth name is Juanita Jane Stone.
Kezz Stone's birth name is Kester Jake Stone.
Marianne Stone's birth name is Mary Haydon Stone.
Merritt Stone's birth name is Winfred Merritt Stone.