These very nice earrings are made from solid 14kt yellow gold. We can make them in white gold as well. They are set with 1.43 carat size total of our Shelby simulated red diamonds. The gems are faceted into hearts. We can cut any of our gems into a heart shape if you'd like a different type of gem some earrings like this. Our simulated colored diamonds are just as hard as our white ones. The red has quite a bit more "fire" than a ruby. Give us a call at 231 861-2165 or e-mail kelley@goruby.com and we'll be glad to help you with your desires.