The May Zodiac signs are Taurus and Gemini. Taurus is the bull astrology sign for those born from April 21 to May 21 and Gemini is the twin astrology sign for those born from May 22 to June 21. The start and end days of each sign can vary by a day or two each year, depending on the solar system position in that particular year. The list of Zodiac gemstones per sign varies from source to source, so the main reference we use is the historical Curious Lore of Stones by George Frederick Kunz. These groups of stones are also known as Zodiac birthstones. Other Zodiac crystal sets may…