White gold jonc ring of 18 carats adorned in its centre with a cabochon ruby of 8.83 carats and diamonds - two certificates

White gold : White gold is an alloy of pure gold with copper, Zinc, Palladium or nickel.
Cabochon cut : Means a polished dome shaped gemstone stone, without facet.
Carat : The carat (ct) is a unit of mass equal to 2 g. Carat is used for measuring the weight of gemstones.
Diamond : In mineralogy, diamond is an extremely rare, precious and hard (named after the ancient Greek "unbreakable") metastable allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice.