SriGemCubic Zirconia/Zircon/White Zircon Diamond or American Diamond All Carat or ratti Approx Weight - Certified

The media could not be loaded. I bought 1 Ct for Rs 990. The size of the 1 carat diamond is 6 mm, as promised by the seller when I asked him. This size is perfect, exactly what I was looking for. It can be seen in the images when I have kept the diamond on my finger which already bears a Tanishq diamond ring. I will give this diamond to the jweller to make the ring and I need to wait how it looks in the ring. There is a certificate along with the box but that can't be verified. The link for verification provided doesn't work and says invalid certificate.

Genuine stone as per the description

I liked it most... reasonable and effective

From whom (which lab) this zircon is certified.