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Sale HK029 | Lot 155
Paraiba Tourmaline and Diamond Pendent Necklace
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Lot 155
Paraiba Tourmaline and Diamond Pendent Necklace

Suspending a cushion-shaped paraiba tourmaline weighing 67.61 carats, surrounded by marquise-, pear-shaped and brilliant-cut diamonds extending to the necklace, the diamonds together weighing approximately 8.00 carats, mounted in 18 karat white gold, length approximately 416mm, pendant detachable.

Accompanied by GIA report numbered 2336971031, dated 21 October 2019, stating that the 67.61 carat tourmaline is Greenish Blue colour; along with comments, stating that 'This copper and manganese bearing tourmaline may be called "Paraíba tourmaline" in the trade.';
GRS report numbered GRS2021-088865, dated 31 August 2021, stating that the 67.60 carat tourmaline is natural, Greenish-Blue (GRS-type "Paraiba") colour, of Mozambican origin, with no indication of thermal treatment; with comment, stating that 'Contains minor elements (including copper) such as found in tourmalines from Paraiba (Brazil).'.

Discovered in 1987 by Heitor Dimas Barbosa beneath the Paraiba Hill in Brazil, Paraiba tourmaline’s striking neon blues have electrified the gem world. Caused by the presence of copper, Paraiba tourmaline appears in a range of hues including greenish blue, bluish green, green, blue, and violet with tremendous lustre and remarkable vividness. The gem’s extreme scarcity in both materials and sizes over 5 carats makes it be a particular fascination for the connoisseurs.
Since 2001, some shining blue-green tourmalines from Nigeria and Mozambique appeared on the market, becoming the new sources of this striking gem. Paraiba gems produced in Africa tend to be larger in size. Because of their larger size, the African Paraiba tourmalines are more uniform in colour than their Brazilian counterparts. Mozambican Paraiba tourmalines are found in a vibrant colour spectrum, ranging from blue-green, purplish red, violet to blue and turquoise.
Heat treatment is a common enhancement in Paraiba tourmalines. The stone is heated in relatively low temperature. Heating does not alter its chemical composition while enhancing the colour nor affect the overall stability of the gemstone, thus it is universally accepted in gemstone industry. Comparatively, untreated high quality Paraiba tourmalines are truly rare and special.
This autumn, Tiancheng International is pleased to offer a stunning 67.61-carat unheated Paraiba tourmaline (Lot 155) from Mozambique. A true lure of impressive size and electrifying blue hue, this neon-bright gem evokes a mesmerising glow that makes everyone set eyes on.