These tiny Blue Apatite stud earrings are made from a genuine Neon Blue Apatite gemstone. The color is such a vibrant blue color. They are carefully made by hand using solid Sterling Silver. they have a Silver post and earring back. The stone measures only 4 mm in diameter, a simple yet exquisite pair of stud earrings. They made a great upper ear, second hole piercing or cartilage piercing stud. They come in a nice gift box.