The salvaged bone used to hand-carve these earrings comes from a domesticated water buffalo used for cultivation and food. To minimize waste, they are respectfully utilized for this form of art and income. The white colored bone has a vibrant polished shine, is light in weight and very durable. Due to the natural characteristics of the material some slight variations in color may occur. The Mother of Pearl shell from New Zealand is typically golden yellow on one side and a pearly white on the other. The 19ga surgical steel post is 100% hypoallergenic.