Tag Archives: 813ct huge rough diamond bought

Diamond Services reports a lowering threshold for synthetic diamonds, as man-made stones as small as 0.0025 cts. discovered in New York

Barely visible on the electronic scale, these tiny single-cut diamonds were discovered by Diamond Services to be laboratory grown.

HONG KONG: JULY 11, 2017 – Multiple single-cut diamonds, sized from a quarter point to half a point (0.0025-0.005 carats), which were contained in jewellery recently submitted for testing to a Diamond Services laboratory, have been found to be synthetic, greatly expanding the range of goods that can be considered at risk of improper and deceptive disclosure.

The jewellery in question was originally submitted to Diamond Services’ laboratory in New York, and after several stones were detected as being potentially laboratory grown. Due to their size, the owner agreed that 11 of them set in eight rings, ranging in size from 0.0025 carats to 0.005 carats, could be removed and sent for full analysis at Diamond Services’ facility in Hong Kong. There they were examined once again with Diamond Services’ award-winning DiamaTest system, which ratified that the diamonds were synthetic, and these findings were confirmed by examination with the DiamondView system of De Beers’ International Institute of Diamond Grading & Research (IIDGR) and Diamond Services Mini Raman Spectrometer.

Usually restricted to smaller-sized stones, single-cut diamonds typically have 17 or 18 facets, and some as few as 16, compared to the standard brilliant round cuts, which are made up of the 57 or 58 facets. Most round stones are first polished as single cuts, and then the additional facets are added. But when small stones are concerned, they are left as single cuts.

“To the best of my knowledge, this is the first time that a synthetic single-cut stone has been detected mounted in jewelry, and it is a credit to our Diamond Services procedures and set of equipment,” said Jospeh Kuzi, Diamond Services founder and managing director. “What this means is that almost no diamond can be taken at face value.”

The source of the single-cut synthetics is not immediately apparent, but Kuzi noted that the growing availability of CVD man-made diamond may prove to be a factor. “CVD is being widely in areas outside the diamond industry, and now includes diamond wafers being gown in laboratories for use in the electronics industry. It could be that waste from these labs and factories end up being processed as very small single-cut diamonds for jewellery,” he said.

Diamonds submitted for synthetic screening at Diamond Services facilities are tested using several systems, including the DiamaTest and Mini Raman Spectrometer, both of which was developed by the company. The latter is the only system currently available that can definitely test rough and polished diamonds, both mounted and un-mounted, without the need to refer them for further testing, accurately detecting whether they are HPHT or CVD lab-grown synthetics within seconds.

Diamond Services, which was established in 2012 in Hong Kong, specializes in development of synthetic diamond detection devices. In 2013 it first introduced the DiamaPen®, a hand-held laser device that is able to detect fancy colour synthetic diamonds. In 2014 it introduced DiamaTest®, an innovative system that screens both loose and colourless diamonds for synthetics, for which it won the prestigious JNA 2014 Award. The Mini Raman Spectrometer was introduced to the market in 2015.

Diamond Services synthetic screening services are currently available at the company’s headquarters in Hong Kong (19F Shing Lee Comm. Bldg., 8 Wing Kut St., Central, Hong Kong, tel: +1-852-2536-4555); and in the United States (15W, 47th St., Suite #1404, New York City, tel: +1-844-842-8122).

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Henry Sapiecha

Swiss jeweller buys rights to $63M Constellation Lucara diamond

Cutting and polishing the 813-carat stone could result in one of the world’s largest flawless diamonds

lucara-813-ct-diamond image www.worldwidediamonds.info

The world’s most expensive rough diamond is now in the hands of De Grisogono, a Swiss luxury jeweller and watch maker.

Geneva-based De Grisogono purchased the rights to market Lucara Diamond’s (TSX:LUC) Constellation gem, which sold in May for a record $63 million, at the launch of the 28th Biennale des Antiquaires in Paris. The price was not disclosed.

The company entered into an agreement with Nemesis International when the Dubai-based corporation bought the 813-carat stone from Lucara, which recovered it last November from its Karowe mine in Botswana.

“I love her and I hate her. Love because something like this is so exceptional – I could never dream to be able to have a stone like this in my own hands – and hate her because I don’t know how I’m going to dress her.”

According to De Grisogono, cutting and polishing the Constellation – a process expected to take several months – could result in one of the world’s largest flawless diamonds. The impressive rock weighs 813 carats and measures six centimetres (2.4 inches) across. According to Nickolas Polak, international director of Nemesis, the diamond will be cut in Antwerp and is expected to produce the world’s largest D Flawless diamond, weighing between 300 carats and 350 carats, reported the fashion website WWD.

“(This is) the first time we’ve taken such a historic stone and had full creative freedom to do what we want with it,” CNN quotes De Grisogono CEO John Leitao, who added that the firm plans to transform Constellation into “a stone that rivals the crown jewels.” The company’s founder was even more colourful in his comments: “I love her and I hate her,” said Fawaz Gruosi. “Love because something like this is so exceptional – I could never dream to be able to have a stone like this in my own hands – and hate her because I don’t know how I’m going to dress her.”

Lucara made headlines with an even bigger diamond also dug from Karowe, the 1,109-carat “Lesedi La Rona”  (or “our light” in the Tswana language spoken in Botswana). However that stone, which was expected to fetch $70 million, failed to sell at auction and Lucara is still searching for a buyer.

De Grisogono also purchased the rights to market a 404-carat rough diamond from Nemesis International in May. According to Rapaport News, that stone was recovered by Lucapa Diamond Company (ASX:LOM) at its Lulo mine in Angola.

Three days ago Lucapa dug a 38.6-carat pink diamond, also from Lulo. The coloured stone is the largest “fancy” pink diamond recovered to date from the mine.  The Australian company reportedly sold it last week as part of a parcel of other rocks for a total of $5.8 million.

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Henry Sapiecha