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The Moussaieff Red Diamond


The Moussaieff Red Diamond is perhaps one of the biggest red diamond as graded by the Gemological Institute of America, GIA as Fancy Red.  The trillion cut diamond weighs 5.11 carat.

The Moussaieff Red is reported to have been found by a Brazilian farmer in the Abaetezinho river in 1990, in a region known as Alto Paranaiba which has a reputation as a source of large and fancy-colored diamonds. In the rough, it is believed to have weighed 13.9 carats (2.78 g).  The diamond was purchased and cut by William Goldberg Diamond Corp., where it went by its original name, the Red Shield Diamond. The diamond was purchased by Moussaieff Jewellers Ltd of London sometime in early 2000 and was renamed after her owner.

The diamond was at one time put on exhibition at the Smithsonian National Museum of Natural History in Washington DC in mid of 2003, where other fancy colored diamonds such as the De Beers Millennium Star, the Heart of Eternity and the Steinmetz Pink diamond were exhibited in ‘The Splendor of Diamonds.’

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The Ekati Spirit Diamond


The Ekati Spirit Rough Diamond From Canada's Northwest Territories

A 78-carat rough diamond from the Ekati mine in Canada’s Northwest Territories was sold in Antwerp this week at BHP Billiton’s diamond center for more than $6 million, which is a record for Canadian stones. The previous record was for a 10.22 carat gem, also from Ekati, which sold for $1.2 million. The stone was named the Ekati Spirit by an employee after a company contest.

The stone is internally flawless and is considered to be the mine’s most significant gem-quality finding in the last 13 years. It’s not the biggest stone to come out of the mine, that would be a 182ct stone found two years ago, but that stone was of poorer quality.

No word yet on who the buyer is, although it’s hard not to see a big stone and wonder if Laurence Graff or maybe Lev Leviev is behind the transaction. It’s also not clear if the stone will be cut and set. Stones lose a significant amount of weight when cut so it will be interesting to see what this stone looks like after the master cutters get their hands on it. With stones of this size and value, the diamond plotters often strategize for months, using computer modeling and other methods, before making that first fatal cut.,,  Deidre Woollard

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GIA Diamond Report/Dossier Authentification


I received a number of emails regarding this post, The GIA Diamond Grading Report.  A number of readers are concerned that unscrupulous diamond dealers may use some fake GIA Report, especially now that the technology for counterfeiting is so good that even on close scrutiny the fake report can be passed on as genuine.

I received an email from a reader of mine, Mr Dennis Lee, who is a close friend of my daughter in New York City.  I reproduced his email as below, which is clearly written and self explanatory.

Hello, love what you are doing in your jadeite jade website because all your gemology articles are fun facts to read that gets everyone’s attention – unlike other gem articles that puts people to sleep. Your writing style is very genuine and to the point.

If I may, I would like to give you some insights about your GIA report article. You can verify if the GIA report is authentic by going to:

All you need is the report number and the total carat weight.

Not all GIA graded diamonds are inscribed with the number. Only the Dossier reports and treated diamonds (HPHT, Bellataire, irradiated) will always contain the GIA report number laser inscription.

On unfinished girdle, the laser inscription usually do come off – so if you are looking at an unfinished girdle for a laser inscription, chances are you might not be able to find it. Using steam or ultra -sonic machines on an unfinished girdle diamond will definitely make the inscription come off. The reason why it comes off is because GIA uses a cold laser which is more stable and safer but does not work on unfinished girdles.

There are instances that a fake report and a fake inscription is used – one way to check is through the website I mentioned, and look at the GIA inscription logo. The giveaway is the GIA font style. Another way is from your expertise as a gemologist. It’s easy for us b/c we can loupe the stone and match the inclusions with the plotting. If all else fails, you will have to send the diamond and the report back to GIA and submit it for a verification service. Hope this helps Uncle Lau and best of luck!

Warmest regards,


An example on how to authenticate whether a GIA Diamond Grading Report or a GIA Diamond Dossier is graded and issued by GIA is to go to the website of GIA.

This is the physical hardcopy GIA Diamond Grading Report dated June 16, 2010 with Laser Inscription #GIA2125195295.

Going to the GIA website as above yields the following:

Type in the Report Number and the Carat Weight.

This is the result of the GIA as shown on the internet, which corresponds to the hardcopy report.

Hence, with this authentification you can check whether a GIA Report is genuine or fake.

Thank You very much Dennis.

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Diamond Misshapen Facets


Graphic Representation of a Round Brilliant Cut Diamond

If you are buying some loose diamonds for your own personal setting, the quality will be assured if the diamonds are accompanied by a GIA Diamond Report or a GIA Diamond Dossier.

However, for smaller stones which are not being graded by GIA, then you will have to depend on the integrity of the seller for what he represents to you on the quality.  Your seller may without the least intention to misrepresent his products, however, most of the time the Sales Associate or Sales Rep may not be aware of the quality of diamonds his/her employer is selling.  These are the traders and retailers who depend on the representation of the quality by their own up-line suppliers.

The Color and Clarity grade of a diamond may be difficult to determine for one without experience in grading diamonds and without the proper equipment.  Even the cut of a diamond may be difficult to ascertain.  Say, if you are buying a loose diamond without a GIA grading report, the best is for you to look for the Cut which is not cut to the proportions of an ‘ideal cut’ diamond, instead of looking for the excellent qualities in the loose diamond.

You might be surprised that the human eye is very sharp when it comes to seeing dis-proportionate cut diamonds and it can pick up asymmetrical inconsistencies with a 10X loupe.

The graphic representations below and some brief notes will put you in good footing when it comes to buying some loose diamonds without GIA Grading reports.,,

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The GIA Diamond Grading Report


A GIA Diamond Grading Report

Many readers may have in their possession a diamond (or many loose diamonds) accompanied by a GIA Diamond Grading Report and are well versed in the content of the Certificate.  A graphic image of a GIA Diamond Grading Report is produced here and a brief description and comments will add on to your further understanding of the said report.

Report Date:  The date should be as current as possible.  A report dated many years back is still valid, no question about it.  However, mishandling of the diamond over the years may result in some tiny chips especially around the girdle, where it is the most vulnerable and would thus down-grade the diamond.

Laser Inscription Registry: The alpha character of GIA followed by many numerals are the inscription being laser-ed across the girdle.  This can be viewed carefully using a 10X loupe.  When you purchase a loose diamond and request the store owner or you want to send it to your friendly jeweler for setting, you must ensure that one of the prongs in your ring or pendant do not hide or obscure the laser inscription.   Diamonds with laser inscriptions are seldom bezel set as it will cover the girdle completely.

Shape and Cutting Style: Round Brilliant

Measurement: This is measured in the metric system in millimeters.  The first 2 measurements are the average diameter of the round.  The closer they are the better for this denotes the exact roundedness of the diamond for a Brilliant Cut.  In this said example, the difference is 0.02mm, which is 0.3% of the overall diameter and is negligible.  However, one must not be too overly concerned on this unless the two measurements are miles apart, in which case the Cut Grade will tell you that the cut is Fair.  The last measurement is the depth of the diamond.

Carat Weight / Color Grade / Clarity Grade: Self Explanatory. For further information refer to this post, Costly Crazy Carbon Crystals – The 4 Cs of Diamond.

Cut Grade: This is not the shape of the diamond. Cut is what we call ‘make’ of the diamond.  It defines how well and how proportionate is the cutting to bring out the fire and brilliance of a diamond.  The grades are Excellent, Very Good, Good and Fair.

Polish: Excellent

Symmetry: Excellent

This certificate denotes that the diamond is perfectly cut to what is known in the trade as Triple Excellence.  A 3X diamond commands a premium and may sell above the price of a Rapaport Report.

Fluorescence: None. A diamond’s fluorescence is determined as None, Faint, Medium, or Strong based on its reaction to ultraviolet light.

Key To Symbols: This is the graphical representation of the inclusion found within the diamond.

The exact proportion of the said diamond being graded is represented by the diamond icon which is described as ‘Profile to actual proportions.”

A GIA Diamond Dossier

GIA also issues the GIA Diamond Dossier on a half A4 size paper, full fold. It contains the same grading information as the GIA Diamond Grading Report but without the plotted diagram. As an added security feature, the Dossier service includes a microscopic laser inscription of the report number on the diamond’s girdle.

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Chopard’s 85ct Diamond Mystery Stone


When a jeweler secures a big, beautiful rock—as Swiss firm Chopard told the media this week—then that would seem to be an opportune time to speak at length about it.

Not Chopard. Its strategy: Don’t say a word.

The company issued a media release on Monday about an 85.28 ct. colorless emerald-cut diamond “of extreme purity matched by sparkling whiteness”—like the legendary Koh-I-Noor (read here) from the Golconda mine in India—that it now owns, but wouldn’t release any additional information.

Finished piece possibilities for the stone

“The extreme whiteness and clarity of the stone acquired by Chopard places it in the IIA class, an extremely rare and pure category accounting for approximately 1 percent of all diamonds,” states the press release.

We also know that the stone is available for purchase, and a finished piece of jewelry will be crafted with the purchaser’s input.

Adapted from, by Jennifer Heebner, Senior Editor dated February 9, 2011

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