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How to identify the authenticity of Thai royal jewelry
The picture you uploaded is an appraisal certificate issued by Royal Thai Jewelry Center:

Above is the identification certificate and the number and date of the appraiser.

The following is the description of the identification item: 14K ring, the main stone is yellow sapphire, weighing 0.48 carats, and the matching stone is cubic synthetic zirconia, weighing 0. 12 carats.

Finally, the price.

If I am not mistaken, there should be a photo of the ring you bought on the back of this certificate. This kind of appraisal is different from the official appraisal in our country. As for its authority, I am not very clear. If you are not at ease, you can go to our "National Jewelry and Jade Quality Supervision and Inspection Center" for identification.