A sapphire, diamond, violet sapphire and pearl brooch, by Jar

Designed as a raised rectangular plaque, centering upon a cushion-cut sapphire, weighing approximately 52.57 carats, within a pavé-set color-change violet sapphire surround, with circular-cut diamond trefoils and pearl accents, to the concave pavé-set sapphire sides trimmed by pavé-set color-change violet sapphires, extending diamond trefoils and pearls, mounted in silver-topped 18k gold, 2000, with French assay marks and maker's mark. Signed JAR, Paris - Est. $150,000 - $200,000

Note: With report 92017212 dated 27 February 2009 from the AGTA Gemological Testing Center stating that the data obtained during the examination of this sapphire indicates that the probable geographic origin is Burma (Myanmar). No indications of heating

Literature: Joel Rosenthal and Pierre Jeannet, JAR, Art Books International, Paris, 2002, plate 128

Christie's. Jewels: The New York Sale. 22 April 2009. New York, Rockefeller Plaza www.christies.com

Joël Arthur Rosenthal, dit JAR, le joaillier le plus réputé et le plus discret de notre époque. Né à New York en 1943, il s'est installé place Vendôme en 1977, dans la pure tradition de la haute joaillerie, jouant d'une technique illusionniste et d'une sensibilité sans pareilles dans le choix des métaux et des gemmes.