oval cabochon opal

Opal ring - Sotheby's.   A ring centring on an oval cabochon opal surrounded by circular-cut diamonds.  Sotheby's. Jewels. London | 11 Apr 2013 www.sothebys.com

An Opal and Diamond Dress Ring. Photo: Christie's Images Ltd 2012 The oval cabochon opal within a tapered pavé single-cut diamond surround, finger size L - Estimate £2,000 - £3,000 Christie's. Jewellery. 5 September 2012. London, South Kensington

An opal and diamond brooch-pendant, circa 1905. Photo Bonhams The oval cabochon opal within a millegrain-set surround of single-cut diamonds, interspersed by three collet-set old brilliant-cut diamonds at each cardinal point, diamonds approximately 0.90 carat total, detachable brooch fitting deficient, length 3.6cm. Sold for £8,125 Bonhams. Fine Jewellery, 25 Apr 2012. London, New Bond Street www.bonhams.com

Opal and diamond pendant The oval cabochon opal set within a frame of circular-cut and cushion-shaped diamonds, further decorated with triangular- and pear-shaped cabochon opals and rose-cut stones. Est. 10,000—15,000 CHF - Lot Sold.  12,500 CHF Sotheby's. Magnificent Jewels and Noble Jewels And A Celebration of Taste and , Magnificent Jewels from a Private Collection. 12 May 09. Geneva www.sothebys.com photo courtesy Sotheby's

25.69 carats oval cabochon opal and diamond ring The oval cabochon opal weighing 25.69 carats, framed by small round diamonds, the sides and band further decorated with small round diamonds, the total diamond weight approximately 1.80 carats, mounted in platinum, size 6. Est. 10,000—15,000 USD. Lot sold 18,750 USD NOTE: Accompanied by GIA report no. 15682925 stating that the opal is natural, natural color Sotheby's. Magnificent Jewels. 23 Apr 09. New York www.sothebys.com Photo courtesy Sotheby's