8K eighteenth-century portrait ring under crystal of Sarah Churchill, Duchess of Marlborough. Miniature portraits were painted on vellum or ivory and given as tokens of love to husbands and wives or parents and children. Portrait rings with diamond bezels, such as ours, reflect the importance of the subject. The paintings would be commissioned to the leading miniature portrait artists of the day. Sarah Churchill had a close friendship with Queen Anne of England. This ring was likely a love token between Sarah and husband John Churchill, 1st Duke of Marlborough. Among the most famous descendants of Sarah Churchill are Winston Churchill, Princess Di, and her sons, William and Harry. The ring is a US size 6 1/2.