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The Perfect Pink Diamond – US$23.2 Million


Christie’s Hong Kong sold its highest priced jewel at the autumn sale on Monday, November 29, 2010. A rare 14-carat diamond called the “The Perfect Pink” was sold for HK$179.9 million ($23.2 million), the most expensive in Asia, after an intense bidding session.

Lot Description

Set with a rectangular-shaped fancy intense pink diamond weighing 14.23 carats, flanked on either side by a rectangular-shaped diamond weighing 1.73 and 1.67 carats, mounted in 18k rose and white gold, ring size 5½.

Accompanied by report no. 14432611 dated 16 May 2005 from the Gemological Institute of America stating that the 14.23 carat diamond is fancy intense pink, natural color, VVS2 clarity, with excellent symmetry.

Accompanied by a note no. 1009543 dated 24 September 2010 from Gübelin Gemmological Laboratory stating that diamonds are classified into two fundamental groups based on the relative presence or absence of nitrogen incorporated into the crystal structure, as determined by the infrared spectrum. Type I diamonds contains appreciable concentrations of nitrogen, whereas type II diamonds are chemically very pure and do not reveal infrared absorption characteristics related to nitrogen. A further separation of these two groups includes type Ia (nitrogen atoms present in pairs or groups), type Ib (isolated nitrogen atoms), type IIa (no measurable traces of nitrogen) and type IIb (traces of boron). Based on its infrared spectrum, the diamond of 14.23 carats is classified as a type IIa diamond.

Also accompanied by two reports no. 2125332554 dated 21 July 2010 and 17550927 dated 3 August 2010 from the Gemological Institute of America stating that the 1.73 and 1.67 carat diamonds are D color, internally flawless clarity.

The Perfect Pink

Gem connoisseurs have long considered pink diamonds to be among the most beautiful of gemstones since they were first discovered in the ancient mines of India.  Larger specimens rarely come up for auction and their scarcity makes the sale of The Perfect Pink, a 14.23 carat fancy intense pink diamond, an extraordinary event. Indeed, large polished pink diamonds with this intensity of color are virtually unheard of– in fact, fewer than 10% of pink diamonds weigh more than 0.20 carats.

Beyond its impressive size, The Perfect Pink is a paragon of perfection in terms of its color, clarity, and cut. While most pink diamonds exhibit a color modifier like purple, orange or grey, this specimen shows absolutely no trace of a secondary color, making it exceedingly rare, both commercially and naturally.  Only this requisite richness and depth of its inherent pure pink body color combined with a wonderful balance of tone and saturation can qualify for that coveted Fancy Intense color grading from the Gemological Institute of America (GIA). While the majority of pinks are graded SI (Slightly Included) on the GIA clarity rating scale, this 14.23-carat pink diamond shows no inclusions. Its VVS2 (Very Very Slightly Included 2) grading is due to an internal graining, typical of Type IIa pink diamonds such as this.  Further emphasizing its rarity is the elegant and classic rectangular cut of the diamond, a cut generally reserved for white diamonds.  Rather than a modified cut seen in the vast majority of color diamonds – used to help “release” color – the impeccable emerald cut signals that no additional facets were required to intensify its perfect tone.  Taken together, The Perfect Pink is unmatched and stands as a diamond of the highest caliber fit for the world’s most discerning collectors.

Diamond Identification Made Simple


Diamond Identification Made Simple

Diamond is perhaps one of the easiest stone to identify.  There are many physical properties of diamonds that are unique by itself and these characteristics are not found in other colored stones.

Care must be taken that a synthetic diamond will also pass these tests.  Synthetic diamonds have the same properties as natural diamonds except that they are grown in laboratories using various highly technical methods.

The Refractive Index (Read here for RI) is 2.417.  This is perhaps one of the highest RI found among gemstones.  But RI is never used for identification of diamond as the normal gemological laboratory Refractometer does not read beyond 1.80.

The Specific Gravity (Read here for SG) is 3.52 and because cut diamond is very small in nature (a 5ct or 1gm diamond is considered quite big) SG testing is never used.

No See-Through Of A Diamond
Faceted Cut Quartz With See Through

As diamond has a very high RI, when you place a Round Brilliant Cut Diamond onto a pencil drawn line or some typed words, there is a no see-through effect, that is, you cannot see the line or the words inside the diamond.  In fact this is a quick and dirty test for diamond identification as you can do it everywhere.

Frosted Girdle On A Diamond

Most diamonds have a frosted girdle not found in any colored stones.  Cutters normally will leave the girdle frosted in order that this can be identified as a diamond easily. However, some of the girdles are polished, so if you have a polished girdle you cannot jump to conclusion that this is not a diamond.

Sharp Facet Junctions In A Diamond

As diamond is the hardest mineral (Read here for Mohs hardness) hence, it has very sharp facet junctions.  If you see a lot of tiny fractures along the faceted junctions of a colorless stone, it is not likely a diamond.

Fractures In A Diamond Is Step-Like

The way a diamond or a colored stone fractures can give a lot of information on the identity of the stone.  Diamond is the only stone that has a step-like fracture.  (compared this to glass where the fracture is conchoidal, meaning curve-like).  If you have a cut diamond and there is a sizeable fracture on it, use a loupe (Read here on how to use a loupe) to view the fracture surface carefully.  It is likely that you will see the step-like fracture.

Beardings On The Girdle Of A Diamond

Most diamonds have tiny root-like tendrils protruding perpendicular to the girdle which are called beardings.  However, in very well cut diamonds you may not find any of these beardings.  If you have beardings then the specimen stone is a diamond.

Trigons Are Natural Indentations On A Diamond

Trigons are minute triangle-like crystal indentations on a rough diamond.  Most cutters will try to retain these trigons on the side of the girdle.  But these are rare and the price of a particular diamond with trigons on the girdle have a very high premium.

A Diamond Tester Is A Convenient Tool

And of course a diamond tester is the easiest way to identify a diamond.  Diamond is a very good conductor of heat.  When a diamond tester is switched on, the probe will heat up and when it touches a diamond the heat is conducted away quickly which will be indicated with a small high pitched sound and normally a green indicator will alight.  Other stones will not respond to this test.  However, Mossainite, a type of synthetic stone, will respond positively to this test and you have to separate it between the two.  (This will be dealt with in a future post).

Good luck to you.

Photo courtesy:,,,,,,,,,,,,,,,

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.’

Ref :,,
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The Eureka Diamond

The Eureka Diamond - from De Beers Archives









The Eureka Diamond – from De Beers Archives

The Eureka Diamond, weighing 21.25ct in the rough and 10.73 ct when finally cut, had numerous internal flaws.  It is not by ordinary standards exceptional but it was the first diamond to be discovered by pure accident in South Africa in 1867 and therefore has historical significance.

In 1866 a shepherd boy found a small, shiny stone on the south bank of the Orange River near Hopetown. The pebble was kept for a while by a 15-year-old boy named Erasmus Jacobs, who later gave it to his neighbor, farmer Schalk van Niekerk, a collector of unusual stones.

Van Niekerk entrusted the pebble to John O’Reilly, a traveling peddler, who sent it, in an unsealed envelope, to Dr W.G. Atherstone of Grahamstown, one of the few people in the Cape Colony who knew something about minerals and gems. Dr Atherstone identified it as a 21.25-carat brownish yellow diamond. It was later sold for £500 to Sir Phillip Wodehouse, the Governor of the Cape Colony.

In 1870 Sir Philip returned to the UK, and there the Eureka was to remain for almost 100 years. It was cut and, over the course of almost a century, changed hands a number of times.

It remained in a private collection until, in 1967, exactly 100 years after its discovery, De Beers purchased the Eureka, gifting it to the people of South Africa.


The Eureka was placed on permanent loan by the South African government at the Mine Museum, Kimberley – a fitting venue to display the gemstone that established South Africa as one of the world’s richest resources of diamonds.

The Winston Blue Diamond


winston blue diamond

THE WINSTON BLUE offered on May 14th at Christie’s Magnificent Jewels sale achieved a stunning US$23,795,372  (World Record Price $1,799,953 per carat).

The largest flawless Fancy Vivid blue diamond in the world, weighing 13.22 carats, was named THE WINSTON BLUE by Nayla Hayek, CEO of Harry Winston.

“In January 2013 we purchased Harry Winston and since then my ambition has been to acquire the most desirable and unique gems. When Christie’s announced they were offering the largest flawless fancy-vivid blue the GIA had ever graded, I had to buy it. Today, I am proud to own the most beautiful blue diamond in the world: THE WINSTON BLUE”, said Nayla Hayek – CEO Harry Winston.

Lot Description – THE BLUE
The fancy vivid blue pear-shaped diamond, weighing approximately 13.22 carats, flanked on either side by a pear-shaped diamond, weighing approximately 1.00 and 0.96 carat, in blue leather fitted case
Accompanied by report no. 17490678 dated 25 March 2014 from the GIA Gemological Institute of America stating that the diamond is Fancy Vivid Blue colour, Flawless clarity, a Diamond Type Classification letter stating that the diamond is Type IIb, and a letter indicating that the diamond ‘ is the largest Flawless, Fancy Vivid Blue, Natural Color, diamond (…) graded as of the date of this letter’

Report no. 16935589 dated 12 May 2008 from the GIA Gemological Institute of America stating that the 1.00 carat diamond is D colour, Internally Flawless clarity

Report no. 16875165 dated 12 May 2008 from the GIA Gemological Institute of America stating that the 0.96 carat diamond is D colour, Internally Flawless clarity.

13.22克拉梨形鮮彩藍色Type IIb鑽石,附GIA證書,兩旁以約1.000.96克拉梨形D/IF鑽石點綴,配藍色皮盒瑞郎19,000,000-23,000,000 *若中英文拍品描述有任何歧義,概以英文版本為準。

Acknowledgement :

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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