Blue Sapphire
Sapphires are among the most iconic and sought-after gemstones in the world, celebrated for their rich, velvety hues and exceptional durability. They are most commonly found in Sri Lanka, Kashmir and eastern Africa, including Madagascar. Sapphires come in every color, and blue in particular comes in light to dark tones.
9 on the Mohs hardness scale, but must be set properly (either in platinum, a bezel or thicker yellow gold prongs)