Natural Diamond Petite Heart Stud Earrings. Gold Plated .925 Sterling Silver. A mixture of baguette and round cut stones in these dainty studs. Finished with a post back closure. Diamond 0.88 CTW Earring Size: Approx. 5mm New with tags. About Natural Diamonds: Natural diamonds are rare, billion-year-old gemstones formed in the Earth’s upper mantle under extreme heat and pressure, composed of crystallized carbon. Brought to the surface via volcanic eruptions, traveling at 30 to 40mph. They are prized for their unique geological history, unmatched durability, and brilliance. The diamond is also known as a “stone of innocence”, signifying purity and constancy.