18ct Yellow Gold Lab-Grown Pendant Certificated Fancy Intense Brown Pink 0.80ct Brilliant Cut Diamond. This Lab-Grown Solitare Diamond Pendant in 18ct Yellow Gold offers great value including 18ct Yellow 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.