Solitaire ring in 18 ct white gold (750/1000). 1 brilliant round diamond 0.55 carats

White gold : White gold is an alloy of pure gold with copper, Zinc, Palladium or nickel.
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.
Modern cut : Cut made after 1919 according to the cutting rules described by "Marcel Tolkowsky" in his book "Diamond Design".