In Exodus 28:15, God appointed Aaron as the High Priest and instructed him to wear a breastplate mounted with twelve different gemstones to represent the twelve tribes of Israel.  Before taking decisions, the Israelites consulted the breastplate.  If the stones glittered, God was in favor.  If they grew dull, it signified God's disapproval.  The sages of the ages believe that gemstones possess spiritual powers.  The modern birthstones originate from Aaron's breastplate. These pieces of jewelry are mounted with quality gemstones handset with professional skill in sterling silver.