Causes of colour in heat treated brown diamonds and synthetic brown diamonds are similar to treated pink diamonds.
In natural diamond the colour is related to a lattice imperfection. This can be mimicked in synthetic or treated diamond by a variety of treatments including annealing, heating or irradiating. The heat and pressure or irradiation can result in the lattice deviation resulting in the brown or pink colour.
Synthetic brown diamond is created by compressing graphite under extreme pressure and heat to above 1500 Celsius. The treatments were perfected in several laboratories in Russia, United States and China.
Lazare Kaplan Internationals Belgium subsidiary Pegasus Overseas Ltd marketed the General Electric processed diamonds under the name GE POL or in the USA as Bellataire.
This led to a technique for creating, or treating brown diamonds into higher valued colours like yellow or colourless diamond.
The disclosure of the treatment is noted by the “GEPOL” inscribed on the girdles of every treated diamond.
Brown diamonds are often marketed with expensive sounding names like Cognac, Champagne or Chocolate diamonds. Natural brown diamonds are a cheap alternative to more expensive colours.
Recently there has been a lot of controversy in the diamond and jewellery trade regarding over graded diamonds. This led to one laboratory being banned from listing on Rapaport. Video
If you have any concerns about your diamond DCLA Laboratory will check it for you FREE of charge.
Mark Gershburg CEO of GSI said that after decades of just mining rough diamonds. Botswana capital Gaborone now cuts, polishes and sells diamonds.
This has created demand for gemmological laboratories. Therefore Gemological Science International has now opened a laboratory in Botswana’s trading centre.
Simple reason is online sales don’t have the expense of retail location, security and personnel.
All of these add to the cost of the diamond, but not the value.
But before you do buy, ask these questions.
Do all online diamond sellers ship free of charge?
Can you view before buying, if you wish?
Is the diamond certified by an IDC or equally highly recognised Laboratory?
Is the diamonds quality guaranteed?
Only at the DCLA Diamond Exchange the answer is yes to all these questions.
The Diamonds are certified by the best laboratories in the world and are Fully Guaranteed.
The shipping is Free across Australia.
And most important, a trained diamond grader will personally show you all the diamonds attributes, as well as explain all the details so that you understand and make an educated decision before you buy.
This is all done as a free service complements of the DCLA laboratory which is the only qualified and state of the art IDC Laboratory in Australia.
Petra Diamonds has recovered a 29.6 ct blue diamond, possibly the rarest and most coveted in the world.
Cailey Barker at brokers Numis said the diamond could fetch between $15 million and $20 million at auction.
Chief Executive Johan Dippenaar said “this is probably the most significant stone we’ve ever, in terms of blue stones, recovered”. At the mine is located in South Africa.
Much has been written in the past month concerning synthetic diamonds being represented as natural diamonds. We at the DMIA believe that it is imperative that the industry respond immediately and forcefully.
DMIA issued a formal call to action 18 months ago in May of 2012 (reprinted below in its entirety) and do so again now. In our view, one of the major problems in attacking this issue is the lack of cohesion from stakeholders all of whom are rightfully very concerned.
As an industry leader DMIA is indeed making progress as we are in constant contact with local as well as Federal law enforcement agencies, the United States Department of State, and our domestic industry leaders; among them GIA, JA, AGS, MJSA, JVC, to mention just a few.
We once again call on the international and domestic leaders from industry, law enforcement, and laboratories to physically gather together as soon as possible and for as long as is necessary to finalize the best approach.
To that end, we reiterate today that we are ready to host a conclave in New York City and will work immediately with our colleagues to make it a reality.
Ronnie VanderLinden, President
Diamond Manufacturers & Importers Association of America
Blue Nile’s sales rose 20 % year on year for the third quarter of 2012. Turn over for the third quarter was $89.8 million.
4 quarter sales are expected between $140 million and $153 million, compared with $112 million in the fourth quarter of 2011.
We are excited to report solid results in the third quarter, with accelerating revenue growth and expanding earnings per share, Said Blue Nile.
With continued steady execution of our strategy coupled with exciting product offerings for the holiday season, we believe we are well positioned to achieve our goals for 2012.
The new HRD Antwerp lab is located in the heart of the new diamond district.
HRD offers quality certification services in accordance with the IDC that reflect its pledge to ensure compliance with the same stringent quality standards applied in Antwerp, where its parent lab is located. The new facility is staffed with both local and Antwerp expert gemmologists.
BlueNile is widely consider to be the world’s best place to buy GIA certified diamonds at the lowest prices, but is it a good deal?
Buying diamonds online is risky, ensure you take measures to protect your purchase.
The DCLA offers this advice:
• Use the two week return policy wisely by sending the stone and report into the DCLA Laboratory to be verified.
• Check the proportion grade, it is more important to the quality of the diamond and more scientific overall than a cut grade.
• Check the comments on the Diamond Certificate: clouds, graining and other structures or inclusions may affect the transparency of the diamond.
• Make sure the diamond is laser inscribed, with the Diamond Report number. This will help provide security and is a permanent identification.
• Don’t buy the cheapest stone available, it is cheap for a reason!
BlueNile is a Forbes 500 listed company and has a great reputation, but buying on the internet is dangerous if you are uninformed.
Make an informed decision and verify your purchase. The DCLA Laboratory will confirm the diamond is the diamond matching the report.
If you are one of the many people buying a diamond with a GIA certificate online from BlueNile or other sites, call the DCLA for advice… it’s free, and could save you thousands.
