A Sacred Cluster of Untreated Ceylon Blue Sapphires and Intricate Silver Milgrain As displayed, this exquisite oval medallion captures the mesmerizing beauty of a midnight sky. Unlike standard heat-treated gemstones, the 32 natural sapphires embedded in this piece are completely natural and untreated. Sourced directly from the legendary gravels of Sri Lanka (Ceylon), they possess an innate, unheated velvet blue color created entirely by the earth over millions of years.