Saturday, 17 January 2015

Red Diamonds

Pure red diamonds devoid of secondary hues are the rarest in the world. The Argyle Diamond Mine is the only known significant source of pink and red diamonds, producing over 95% of the world's supply. In the last 30 years of mining, Argyle has found a total of nine red diamonds.

Red diamonds are so rare that there is little gemological information about them. What is known is that crystal lattice defects showing stress lamination during the diamond's formation are the cause of the red color.
The Kazanjian Red Diamond, One of the three known red diamonds weighing more than 5 carats. The gem was discovered in the 1920s in Litchenburg, South Africa.

It was 35 carats uncut. A diamond broker paid eight pounds per carat for it.
The Moussaieff Red Diamond is a diamond measuring 5.11 carats with a triangular brilliant cut, rated in color as Fancy Red by the Gemological Institute of America. It is the world's largest known red diamond.

The Moussaieff Red was discovered in the 1990s by a Brazilian farmer in the Abaetezinho river in 1990, in a region known as Alto Paranaiba. The rough stone weighed 13.9 carats.
The Rob Red Diamond is modest in size at 0.59 carats but it still holds a special place in the diamond world. The Rob Red is rated as the most intense red diamond ever discovered. The diamond is rated fancy purplish red by the GIA and is considered the most important red diamond in the world.
The De Young Red is 5.03 carats and graded as Fancy Brownish Red. It was found in South Africa in 1927. The stone was once mistakenly sold as a red garnet that was set in a hat pin.

Eventually the garnet was proven in fact to be a diamond. The diamond currently resides at the Smithsonian.
The Supreme Purple Star. There is very little known about this diamond. The uniquely coloured stone came to the world’s attention when it surfaced in London in 2002. When the owner took it to an appraiser in London, he was not aware of its rarity. The colour of the diamond changes as it is rotated. It goes from a deep purple to a vivid purplish red making it a diamond unlike any seen before.

It is unknown what has become of the diamond.
A heart-shape fancy red diamond ring by Moussaieff set a world auction record at Christie’s Hong Kong on November 25, 2014.

The 2.09 carat ring sold for $5,095,872, setting a new record of $2.44 million per carat.

3.15 carat Fancy Reddish Orange

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Monday, 5 January 2015

NY Diamond Auction Week

Sotheby’s totaled sales $44,151,251 against a $37 million estimate with an auction comprised of jewels and pieces from collections with highly pedigreed provenance. The top lot of the sale was a platinum-topped gold and diamond necklace that was gifted to Helen Hay when she married Payne Whitney in 1902 — a top headline society event of its day.

GIA certifies that the 27.48-carat, pear-shaped diamond is F-color, VS1-clarity; the 15.53-carat pear-shaped diamond is G-color, VS-1 clarity; the 13.08-carat, pear-shaped diamond is F-color, VS-1 clarity; and the 8.91-carat, marquise-shaped-diamond is H-color, VS-2 clarity. $3.2m
The centerpiece of this ring is a 25.44-carat, emerald-cut, D-color, VVS1-clarity diamond, flanked by two tapered baguette-cut diamonds. $2.9m

Platinum, 18k-gold, fancy vivid yellow diamond ring . The centerpiece is a cut-cornered rectangular modified brilliant-cut fancy vivid yellow diamond weighing 30.48 carats, and the mounting set with colorless round brilliant-cut diamonds. GIA certifies that the diamond is natural color, fancy vivid yellow, VS2-clarity. $ 2m
Platinum ring with an emerald-cut, fancy intense purplish-pink, SI2-clarity diamond weighing 3.07 carats, flanked by two bullet-shaped diamonds together weighing 0.45 carats. $ 1.2m

Fancy Deep Brown-Orange Diamond Ring. The 18k-gold ring is set with a marquise-cut, fancy deep brown-orange diamond weighing 50.34 carats. $ 1.1m
An Iconic Platinum, Colored Stone, Diamond And Enamel “Tutti Frutti” Bracelet by Cartier New York circa 1928.

$ 2,165,000. A world auction record for a Tutti Frutti bracelet by Cartier.

At Christies a 89.23-carat D/VVS1 pear-shaped diamond was the top lot of the day at $11m.

A 21.30-carat fancy light pink Golconda diamond. $4,253,000
Modified oval-cut fancy red diamond, weighing approximately 1.42 carats. GIA diamond is fancy red, natural color, VS2 clarity. $2,165,000

A suite of colored diamond jewelry by Jahan, including a necklace with seven fancy yellow and brown diamonds ranging from 52.30 carats to 11.51 carats. $4,645,000

Thursday, 1 January 2015

The Golconda Diamond Mines of India

Golconda, also known as Golkonda or Golla konda ("shepherd's hill"), is a ruined fort of Southern India and capital of the medieval Golconda Sultanate (c.1518–1687). It is situated 11 km west of Hyderabad.

The region is known for the mines that have produced some of the world's most famous gems.
The Golconda fort was built in 945-970 CE. It fell into ruins after a siege and its fall to Mughal emperor Aurangazeb in 1687 AD.

Golconda was a region located between the lower reaches of the Godavari, Wainganga, Wardha and Krishna-Venva rivers, in the present-day states of Maharashtra and Andhra Pradesh, central India. Today, the exact source of the so-called "lost mines of Golconda" are unknown, and India's only remaining diamond source is the Majhgawan pipe near Panna.
Millions of years of erosion caused by rainfall and snow-melt unearthed the diamonds from their kimberlite tomb, washing them downstream to their final resting place within the shallow alluvial river gravels of India's Golconda region.
The term "Golconda diamond" is still used today as an indicator of very high-quality diamonds. To justify the "Golconda" name, diamonds must have a level of transparency and quality found only in rare, chemically/optically pure type-IIa natural diamonds. The term "Golconda" is also used as a generic term to describe higher quality diamonds with an antique cut.