Product Code SKU7035. 9ct Yellow Gold 4mm Emerald & Diamond Studs. There are two types of Emeralds, Natural and Created. Natural Emeralds generally have flaws and inclusions, due to this, naturally clean Emeralds are rare and attract a higher premium. Modern technology has allowed us to grow Emeralds in laboratories which allows the creation of flawless stones with the same chemical optical and physical attributes. The only difference is these are grown in labs rather than mined. Emerald is the birthstone for May and the 20th anniversary stone. Beautifully presented in a gift box.