Sculptured Solitaire Engagement Ring. Center diamond is not included and can be purchased separately. RIng can also be custom made to hold a provided center diamond. Blending art with jewelry design, this unique engagement diamond ring can be set with many different types of diamond center stone cuts. the bottom of the ring is formed to created a sculptural european soft square shank bottom to help in keeping ring from turning around finger and also adds a design flair to the over all design.