Sterling Silver Natural Ruby Mini Stud Earrings Ct.tw 0.30 Hand made and hand crafted by master jeweler in USA We guarantee that these ruby are conflict free based on written guarantees by our suppliers The gold in our products is produced in more socially and environmentally responsible ways Four characteristics, known informally as the four Cs, are now commonly used as the basic descriptors of ruby: these are carat, cut, color, and clarity Check our measurement comparison chart on our storefront page