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At YES, we take care to ensure that our jewellery is of the highest quality. Both precious metals as well as pearls, diamonds, and other precious gemstones come with certificates confirming their authenticity, value, and finest quality.

Diamond certificates

The quality of diamonds is attested by the YES Certificate. Diamonds weighing 0.5 ct or more additionally come with a certificate from the International Gemological Institute (IGI) or the Gemological Institute of America (GIA). Each YES® Ideal Diamond also comes with a GemEx certificate.

Pearls certificates

For YES Pearls, a special certificate is awarded, confirming their value and authenticity. We select natural pearls, thereby emphasizing quality and their pure beauty. Information on the certificate includes the design, metal purity, pearl type, trade name, shape, colour, setting, diameter, origin, and quality.

Certificate of authenticity

The certificate is added to products to confirm the type of gemstone. Information included on the certificate consists of the design, setting, metal purity, main gemstone, and other gemstones.


Precious gemstone certificate

This certificate is added to products with precious gemstones. It contains information about the type and quantity of gemstones, their cut, and weight.