Adam's Fine Jewellery & Watches September 18th 2018

83 134 A PAIR OF JADE JADEITE, CHROME DIOPSIDE AND DIAMOND EARRINGS, BY MARGHERITA BURGENER Each polished square jadeite jade plaque set at the centre with a rectangular step-cut chrome diopside, within a pavé-set round brilliant-cut diamond border, mounted in 18K gold, diamonds 0.96ct total, chrome diopside 2.80cts total, signed Margherita Burgener, maker’s mark, Italian assay marks, maker’s case, length 2.3cm € 3,300 - 4,300 Until very recently diopside was well-known only in the realm of serious gemstone col- lectors. Recently however, the forest-green chrome diopside variety, which is similar to emerald, has begun to appear more regularly on the high-jewellery market. 135 AN 18K GOLD AND DIAMOND MANUAL WIND WATCH, BY CHATELAIN, CIRCA 1965 17-jewel manual wind movement, the diamond-set dial with black sword hands, the 18K gold polished case with four back screws, diamond-set bezel and gem cabochon crown, to a leather strap bracelet and 18K gold buckle signed ‘A.W’, movement signed ‘Chatelain’, movement no. 2118, ref. no. 16, case no. 10553, Swiss assay marks, with maker’s leather box, case (in- cluding crown: 2.7cm) € 1,000 - 1,500 136 A PAIR OF JADEITE JADE AND DIAMOND EARRINGS, BY MARGHERITA BURGENER Each designed as a stylised green leaf of jadeite jade with engraved details, set with a central line of round brilliant-cut diamonds, mounted in 18K gold, diamonds 0.14ct total, signed Margherita Burgener, maker’s mark, Italian assay marks, with maker’s case, length 1.7cm € 800 - 1,200 Based in the Swiss watchmaking centre of La Chaux-de-Fonds in the Jura mountains (also the home of Ermeto, lot 88), G&F Châtelain SA was established here in 1947 by brothers George and Francis Châtelain.Trained by their mother in a small workshop polishing and repairing gold parts, as the economy returned to life in the aftermath ofWorldWar II, the brothers set up their own workshop, initially only pol- ishing clasps for leather bracelets. Before long they began to expand their business and expertise as jewellers and watchmakers.Today the company remains an independent house and is well known for its dynamic watches with complex movements and also for its jewellery lines.