Real Diamonds are precious gemstone found in the earth naturally. They’re expensive because of demand and it’s rare to find large,good-quality natural diamonds.
Lab grown diamonds have identical properties as natural diamonds. Just they are made in lab and thus much cheaper. It’s a good choice if you still want a diamond and don’t care how it is made.
Moissanite is a completely different gemstone that looks near identical to diamonds, but has different properties. It’s a good choice if you just want a white sparkly stone and is budget friendly.