White gold :
White gold is an alloy of pure gold with copper, Zinc, Palladium or nickel.
Solitaire :
A "Solitaire" diamond ring, means a ring with only one diamond. It is the most popular setting for engagement rings. The "Tiffany setting" is the most famous of them.
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.