Who discovered an October birthstone?

Answer 1

The modern October birthstones, opal and tourmaline, were officially recognized in the early 20th century. The National Retail Jewelers Association (now known as the American Gem Society) designated these stones as the birthstones for October in 1912. However, opals have been valued since ancient times, and tourmaline's popularity grew in the 19th century, particularly after it was discovered in the U.S.