According to the practice of jewelry industry, it is a better choice to issue certificates for sapphire bare stones. Bare stone refers to the original gem without inlay, and the quality and authenticity can be guaranteed by issuing a certificate. The certificate is provided by a professional jewelry appraisal institution or laboratory, which records the weight, color, clarity, cut and other indicators of sapphire in detail. This information is very important to buyers and can help them make an informed purchase decision. In addition, the certificate of sapphire bare stone is also helpful for value preservation and identification, which is convenient for future trading and evaluation. Therefore, it is a more reliable and secure choice to issue certificates for sapphire bare stones.