These are lab grown. 

Moissanite, referred to as a diamond simulant, is engineered to give the illusion of similarity to diamonds, but is compositionally and visually quite different from a real diamond. The durability, brilliance, and colour of the two gems are quite distinct.

Moissanite is a more affordable diamond simulant grown in highly controlled laboratory environments using advanced technological processes that duplicate the conditions under which ,moissanite gemstones  naturally develop when they form in the mantle, beneath the Earth’s crust. These lab created gemstones consist of silicone carbide. They are a better option as a diamond simulant compared to Cubic Zirconia as they do not lose their shine.

Each pair of earrings comes with a certificate and presented in a beautiful pink velvet box. 
Choose from 925 Sterling silver or Gold plated Sterling silver. 
Each pair is 1 carat in total.