What is Corundum?

Friday,13 October 2017 07:150 Comments

Rubies are corundum which contain chromium impurities that absorb yellow-green light and result in deeper ruby red color with increasing content. Purple sapphires contain trace amounts of vanadium and come in a variety of shades. Corundum that contains ~0.01% of titanium is colorless. If trace amounts of iron are present, a very pale yellow to […]

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Marcel Tolkowsky

Friday,13 October 2017 07:140 Comments

Marcel Tolkowsky (December 25, 1899 – February 10, 1991) was a member of a Belgian family of diamond cutters and an engineer by education. He is generally acknowledged as the father of the modern round brilliant diamond cut. Many of his family have gone on to become noted diamond cutters, including his cousin Lazare Kaplan […]

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How to Get More Diamond for Your Budget

Friday,13 October 2017 07:100 Comments

Buy a ‘Plus’ diamond. A plus diamond is a diamond that is just under the threshold of the next tier of cost. Diamonds go up exponentially from 1 carat to 1.5 carats and from 1.5 carats to 2 carats and so on. But, if you have a budget that is say $15,000 – $20,000 and […]

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Diamond Cutting

Friday,13 October 2017 07:080 Comments

Mined rough diamonds are converted into gems through a multi-step process called “cutting”. Diamonds are extremely hard, but also brittle and can be split up by a single blow. Therefore, diamond cutting is traditionally considered as a delicate procedure requiring skills, scientific knowledge, tools and experience. Its final goal is to produce a faceted jewel […]

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Diamonds as Investments

Friday,13 October 2017 07:070 Comments

Diamonds, the gems that have symbolized love and marriage for decades, are beginning to attract wealthy investors as a commodity investment with potentially high returns.   Negligible yield on fixed-income investments and volatility in the equity markets are driving the search for a relatively stable investment that can pack some punch in returns. The wealthy […]

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Diamond Trade Subject to Arbitration on Color Grading Standards

Thursday,12 October 2017 02:340 Comments

Members of the diamond trade may face arbitration for dealing in diamonds with a color grade that differs from industry standards by more than one grade, according to a new policy issued by various industry organizations. The bodies are considering extending the policy to include clarity grading.   Formulated by the World Federation of Diamond Bourses […]

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Karowe Mine, Botswana

Thursday,12 October 2017 02:330 Comments

Lucara Diamond Corp. has recovered three exceptional diamonds including a 1,111-carat stone from its Karowe mine in Botswana. The diamond is the second-largest gem-quality diamond ever recovered and the largest to be retrieved through a modern processing facility, the miner said.   The type-II stone, measuring 65mm x 56mm x 40mm, is also the largest […]

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Industry Stock Tracker

Wednesday,11 October 2017 10:110 Comments

Industry-related stocks were broadly down over the past week. U.S. retailers fell, led by Birks Group (-16%) and Nordstrom (-10%). Chinese jewelry retailer shares followed declines in the local Hang Seng index, led by Luk Fook (-7.6%) and Chow Tai Fook (-3.4%). Miners’ shares were largely down, including declines in Rockwell Diamonds (-15%) and Firestone […]

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Market Update

Tuesday,01 August 2017 09:120 Comments

NY jewelry shows quiet. Better goods stable but market sentiment weak. Dealers cautious ahead of summer vacations in Belgium and Israel. Low expectations for next week’s Mumbai show as gold jewelry sales decline after price surge (+28% in Rupee for 2016). De Beers 1H revenue +8% to $3.3B, underlying earnings +5% to $379M. Petra FY […]

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What is a Diamond… Really?

Thursday,06 April 2017 04:320 Comments

Most natural diamonds are formed at high-pressure high-temperature conditions existing at depths of 140 to 190 kilometers (87 to 120 mi) in the Earth. Carbon-containing minerals provide the carbon source, and the growth occurs over periods from 1 billion to 3.3 billion years (25% to 75% of the age of the Earth).   Diamonds are brought close to […]

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