Adam's Fine Jewellery & Watches Tuesday May 15th 2018

14 9 A 19TH CENTURY AMETHYST RIVIERE NECKLACE WITH AN AMETHYST CROSS PENDANT Composed of a graduated row of oval-shaped amethysts, suspending a cross, each arm set with an oval-shaped amethyst, to a circular-cut amethyst centre, mounted in gold, pendant length 7cm, necklace length FP € 2,000 - 3,000 10 A LATE 19TH CENTURY DIAMOND STAR PENDANT The twelve-ray star set throughout with old cushion, brilliant and rose-cut diamonds, mounted in silver and gold, diamonds approximately FWV WRWDO OHQJWK FP € 1,500 - 2,000 11 A LATE VICTORIAN DEMANTOID GARNET AND DIAMOND CLUSTER RING, CIRCA 1880, RUSSIAN The central oval-shaped demantoid garnet, weighing approximately 2.20cts, within a surround of old brilliant-cut diamonds, mounted in VLOYHU DQG . JROG JROG 5XVVLDQ DVVD\ PDUNV ULQJ VL]H / € 2,500 - 3,500 Accompanied by a report fromAllied GemAppraisers Ltd in Chi- cago, stating that the demantoid garnet is weighing approximately 2.20cts, colour is unenhanced and containing ‘horsetail’ inclusions. Dated February 8th 2013 12 A LATE 19TH CENTURY DIAMOND BROOCH, CIRCA 1890 Designed as an insect, with old cushion and brilliant-cut body and wings, mounted in silver and gold, diamonds approximately 2.50cts, de- WDFKDEOH EURRFK ÀWWLQJ ZLWK FDVH E\ ¶6 - 3KLOOLSV /WG 1HZ %RQG 6WUHHW LondonW1’, width 3.9cm, € 800 - 1,200 The demantoid is a rare and highly valuable garnet.When it was first encountered in the 1850s, in the Ural Mountains of Russia, it was mistaken for a peridot due to its rich green hue. Later however, a Finnish mineralogist, named Nils von Nordensheld, recognised it as an entirely new mineral. Speaking before the St. Petersburg Mineralogical Society in February 1864, he pro- nounced it to be a garnet of the andradite variety. It was named demantoid (diamond-like) because of its remarkable similarities to the diamond, making it an extremely attractive and collectable gemstone. The demantoid garnet was frequently incorporated into designs by the Russian jeweller, Peter Carl Fabergé, as well as Art Nouveau and Art Deco pieces byTiffany and Co.