JAR Paris. A PAIR OF RARE AMETHYST BRIOLETTE, DIAMOND AND SAPPHIRE EAR-PENDANTS, BY JAR. The diamond-set links suspending large briolette amethysts, with pavé-set sapphire caps,in the manner of "the 18th and 19th centuries re-invented by JAR", quoting Marie-Hélène,the late Baroness Guy de Rothschild. Price Realized $106,651. The imagination of Joel Arthur Rosenthal, one of the most celebrated and exclusive contemporary jewellers, known to his followers as JAR, seems without limits.