3ct. Blue Diamond to Lead Phillips Sale

Phillips Auction Tiffany Blue

Phillips will feature a blue diamond ring by Tiffany & Co. at its upcoming New York Jewels auction, expecting it to fetch up to $2.5 million.

The cut-cornered square modified brilliant-cut, 3.02-carat, fancy-intense-blue, VS2-clarity diamond ring will lead the December 9 sale, the auction house said Wednesday.

An assortment of colorless diamonds will also go under the hammer, including an emerald-cut, 11.34-carat, D-color, VVS2-clarity, type IIa diamond ring by Harry Winston. The piece, which is flanked by two triangle-shaped diamonds weighing a total of 1.45 carats, has a presale estimate of $500,000 to $800,000. A 1925 Art Deco ring by Spaulding & Co., featuring a modified marquise brilliant-cut, 7.69-carat, D-color, VS2-clarity, type IIa diamond, will go under the hammer for $150,000 to $250,00, while a cut-cornered rectangular modified brilliant-cut, 13.05-carat diamond ring is estimated at $80,000 to $120,00.

Other notable items include a fancy-color diamond and gold necklace, featuring a pear modified brilliant-cut, 3.01-carat, fancy-blue-grey diamond, estimated at $250,000 to $450,000. A cut-cornered square step-cut, 16.23-carat, fancy-intense-yellow, VS1-clarity diamond ring by De Beers carries a presale estimate of $220,000 to $400,000.

Source: Diamonds.net

Botswana unveils rare 20 carat blue diamond

Botswana Blue Diamond

Botswana’s state run Okavango Diamond Company unveiled on Wednesday what is believed to be the largest blue diamond ever discovered in the southern African country, which is one of the world’s top producers.

The 20.46 carat, oval-shape fancy precious rock has been named “The Okavango Blue” in honour of the Okavango Delta, the country’s wildlife rich world heritage site.

From all coloured diamonds, blue stones are the most unusual and so the miner says its find is one of the rarest in the world.

“It is incredibly unusual for a stone of this colour and nature to have come from Botswana a once in lifetime find, which is about as rare as a star in the Milky Way,” Okavango Diamond Company managing director Marcus ter Haar said in a statement.

“It sits in the very top bracket of all time historical blue diamond finds especially because only a very small percentage of the world’s diamonds are classified as fancy colour,” he noted, adding the company expects to sell the stone by the end of the year.

In 2016, a massive intense blue diamond, known as The Cullinan Dream, sold for $25.4 million at a Christie’s auction in New York, breaking all records and becoming the most expensive gem of its kind ever sold at auction.

Last year, a 6.16 carat blue diamond, secretly passed down through European royalty over three centuries, fetched $6.7 million at a Sotheby’s auction in Geneva $1.4 million more than what experts expected it to be sold for.

Arguably, the most famous is the Hope Diamond, also known as Le Bijou du Roi “the King’s Jewel”, Le bleu de France “France’s Blue”, and the Tavernier Blue. The massive, 45.52 carat, deep blue diamond is now kept at the U.S. National Museum of Natural History in Washington, D.C.

Botswana, which was overtaken by Russia as the world’s top diamond producing country in 2014, is grappling with aging mines, as well as power and water shortages.

Still, diamonds are the country’s main source of income and account for about 80% of its exports.

The nation is home to some of the world’s most prolific diamond mines, including Lucara Diamond’s Karowe operation, where the now famous Lesedi la Rona, the second-largest gem-quality diamond to ever be found, was unearthed in 2016.

Source: Mining.com

Blue diamonds may be blue because of where they are formed

Blue diamonds

Blue Diamonds are the world’s most expensive diamonds,  some stones worth tens of millions.

Why they are blue has long been know, But until now nobody has known how rare blue diamonds are made or where they come from.

Now scientists have discovered that they are formed 400 miles below the surface of the Earth, around four times the depth of cape series or white diamonds.

This is where the element boron can combine with carbon in such extreme pressure and heat that it crystallizes into the world’s most precious stone.

And because boron is mostly found on the Earth’s surface, scientists believe that it must have traveled down into the mantle when tectonic plates slipped beneath each other. Eventually volcanic action brought the diamonds up closer to the surface.

Blue Diamond is categorized as type IIb crystal and due to their extreme valuable, it is very rare to find one for scientific research purposes. An rare to find one that contains inclusions.