Hello, the jewelry you bought is a ring set with cubic zirconia in 18K gold. First of all, 18K gold is made of 75% gold+10% silver+15% other precious metals, and it is 18K. Then let me explain to you that cubic zirconia, a kind of artificial gem, is used to make imitation diamonds, also known as Su diamonds. It has an equiaxed crystal system and single refraction, generally around 2. 15-2.22. It is correct to write > 1.8 1 on the refractive index certificate. 2. The mass of14g means the total weight of your ring and stone is 2. 14g. I am a national intermediate jewelry appraiser. I hope my answer is helpful to you.