18ct White Gold Lab-Grown Certificated Square Emerald Cut Diamond 1.06ct D VS2. This 18ct White Gold Lab-Grown Solitare Square Emerald Cut Diamond Pendant offers great value including 18ct White Gold Neckchain - Lab-Grown diamonds are real diamonds created by cutting-edge technology in a laboratory using incredible heat and pressure, mimicing nature. The result is real diamonds with the same characteristics as Natural diamonds at incredible value.