This gorgeous one-piece diamond necklace come with a limited warranty card and a certificate of authenticity from the Gemological Research Association (GRA), as the single moissanite gemstone is less than 0.3 carats. Crafted from 925 sterling silver, it features a 0.51 carat moissanite stone. To ensure longevity, it is recommended to avoid wearing this necklace during exercise due to the potential reaction of sweat with the silver and copper elements, causing deterioration and corrosion over time Gift box included.