14 Kt Tri-Layered White Gold Plate Lab Emerald Necklace

14 Kt Tri-Layered White Gold Plate Lab Emerald Necklace. This Lab Emerald is VVs1 Eye Clean Emerald Cut Measuring 7 x 5 mm. It Is Mounted in 14 Kt Tri-Layed White Gold Over Solid .925 Sterling Silver Which gives this necklace its high polish and shine. The total weight is approx. 2.2 grams including an 18" silver chain. *** This Lab Emerald has the same chemical compounds as natural, mined from the earth Emeralds. The Species is Beryl. The chemical composition is : Be3Al2(SiO3)6. Refractive Index 1.566 to 1.602. Specific Gravity 2.67 to 2.78. Mohs Hardness 8 ***