Lorenz Natter (1705-1763) German, circa 1740

E.R. Raspe and J. Tassie, A descriptive catalogue of a general collection of ancient and modern engraved gems, cameos as well as intaglios: taken from the most celebrated cabinets in Europe: and cast in coloured pastes, white enamel, and sulphur, London, 1791, p. 623, no. 10953 and p. 756, no. 14061 (as HRH Princess Amelia)

Overall the condition of the ring is very good with some minor wear and dirt to the surface consistent with age with a few flecks of dirt in the crevices of her hair. There is a minute chip to the edge of the cameo on the top left.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

Mary was the seventh child and fourth daughter of King George II and Caroline of Ansbach. After her mother’s death in 1737, Mary was brought up by her elder sister, Princess Caroline. In 1740, she was described as ‘a lover of reading and far more solicitous to improve the mind than to adorn the body’. Horace Walpole, who had played with her when they were both children, said she had ‘the softest, mildest temper in the world’. When she was 17, a marriage was arranged for her with Prince Friedrich of Hesse-Cassel (1720–85) and they had four children. Her married life was tumultuous, however, and in 1746, she returned to Britain. Her later years were spent in Hanau with her children, supported by her father-in-law, Wilhelm VIII, who provided a residence for her. She died there on 14 January 1772.

Another signed version of the present model in published in E. Nau, Lorenz Natter 1705-1763, Biberach an der Riß, 1966, p. 103, n. 95.