I bought a sapphire necklace when I was traveling. Have the appraisal certificate of Beijing Xiebao Jewelry Testing Center. Name: S925 (seal) sapphire pendant. Please have a look.
The refractive index is the refractive index of sapphire, and the straight stripes indicate natural sapphire. Synthetic sapphire ribbons are mostly arc-shaped, and S925 is 925 silver. Sapphires inlaid with silver are generally not very good. Besides, are they heated or faded? The price after processing will be cheaper, within a few hundred.