This peach-blossom pink beryl with hints of carmine was the favorite stone of John Pierpont Morgan, a famous American banker, gem enthusiast and an important customer and personal friend of Louis and Pierre Cartier. It was named in his honor by mineralogist G. F. Kunz. Its color is due to the presence of lithium oxide and traces of cesium, a rare alkali metal. Hardness: 7.5. Madagascar, Brazil, United States, Mozambique, Afghanistan.