hat
Nan 1912, nan yon efò pou nòmalize nesans, Ameriken Nasyonal Asosyasyon an bijou, kounye a yo rele Jewelers nan Amerik, te rankontre nan Kansas ak ofisyèlman te adopte yon lis. Konsèy la Industry Bijou nan Amerik mete ajou lis la nan 1952 pa ajoute Alexandrite pou jen, sitrin pou Novanm ak woz tourmalin pou mwa Oktòb. Yo menm tou yo ranplase lapis desanm lan ak zikon ak chanje mervey prensipal yo / altènatif pou mas. Ameriken Gem Komès Asosyasyon an te ajoute tou tanzanit kòm yon birthstone Desanm nan 2002. Nan 2016, Ameriken Gem Komès Asosyasyon an ak bijou nan Amerik te ajoute spinèl kòm yon birthstone adisyonèl pou mwa Out. Asosyasyon Nasyonal Bretay la nan Goldsmiths te kreye tou pwòp lis ofisyèl yo nan birthstones nan 1937.
eng
In 1912, in an effort to standardize birthstones, the American National Association of Jewelers, now called Jewelers of America, met in Kansas and officially adopted a list. The Jewelry Industry Council of America updated the list in 1952 by adding Alexandrite for June, citrine for November and pink tourmaline for October. They also replaced December’s lapis with zircon and switched the primary/alternative gems for March. The American Gem Trade Association also added tanzanite as a December birthstone in 2002. In 2016, the American Gem Trade Association and Jewelers of America added spinel as an additional birthstone for August. Britain’s National Association of Goldsmiths also created their own standardized list of birthstones in 1937.