Adam's Fine Jewellery & Watches Tuesday May 14th 2019

126 T uesday 14 th M ay 2019 226 A PAIR OF DIAMOND AND TITANIUM EARRINGS, BY MARGHERITA BURGENER Designed as foliate sprays, pavé-set throughout with round brilliant-cut diamonds, mounted in 18K gold and titanium, diamonds 4.22cts total, signed Margherita Burgener, maker’s mark ‘MB’, with maker’s case, length 3.2cm € 5,500 - 6,500 228 A PAIR OF DIAMOND EARSTUDS Each collet-set round brilliant-cut diamond weighing approximately 0.30ct, mounted in 18K gold, length 7mm € 500 - 700 225 A TANZANITE AND BLACK DIAMOND DRESS RING The oval mixed-cut tanzanite weighing 5.73cts, within a bombé black diamond frame and gallery, mounted in 18K blackened gold, diamonds approximately 1.50cts total, ring size L € 3,000 - 4,000 227 AN INDICOLITE AND DIAMOND CLUSTER RING The cushion-shaped indicolite tourmaline weighing approximately 5.00cts, within a surround of round brilliant-cut diamonds, to a trifurcated plain hoop, mounted in 14K gold, diamonds approximately 3.00cts total, ring size L € 2,500 - 3,500 229 A RUBY AND DIAMOND CLUSTER RING The cushion-shaped ruby weighing approximately 2.50cts, within a surround of round brilliant-cut diamonds, to a plain hoop, mounted in platinum, diamonds approximately 0.50ct total, ring size I½ € 3,000 - 4,000 Accompanied by a report from GCS laboratory in London, stating that the ruby is of Mozambique origin, with no indications of heating. Report number 79208-39, dated April 8th 2019. 230 A THREE-STONE DIAMOND RING Set with a row of three round brilliant-cut diamonds within four-claw settings, weighing approximately 0.70ct each, to a plain hoop, mounted in 18K gold, ring size O½ € 2,200 - 2,800 The tourmaline is a gemstone favoured by many for its wide range of colours. Of the spectrum, blue is the rarest, with paraiba tourmalines being well known for their high value and collectabil- ity.While the paraiba tourmaline gets its colour from the presence of copper, the indicolite tourmaline, is another rare variety of blue tourmaline which is coloured by iron. It is strongly pleochroic (i.e. will show different intensities of colour when viewing from dif- ferent angles) and generally varies from a light to a deep blue.The name indicolite is derived from indigolite, a nod to the intense indigo colour of the stone, although these tourmalines can also sometimes be of a greenish hue.