Gem Diamonds recovers 80 carat rough diamond

 

80 carat rough diamond

 

Another D colour Type II diamond weighing 80 carats has been recovered.

Shares in Gem Diamonds spiked on Thursday after the miner announced it had recovered one of the highest quality stones to come out of its Letseng mine in Lesotho.

The discovery of this 80 carat diamond comes less than a month after the miner announced the recovery of a 114 carat rough diamond. And two years after Gem Diamonds found a 357 carat rough diamond, which sold for $19.3 million.

Gem Diamonds has recovered four of the 20 largest white gem quality diamonds ever recovered, which makes of the Lesotho mine the world’s highest dollar per carat kimberlite diamond operation.

This Blue Diamond Is Natural—and Also Synthetic

The good news is, from everything we know, all lab-grown diamonds are detectable, and the detection devices are getting better and (somewhat) cheaper.

The bad news is that unethical people are still apparently devising new and innovative ways to cheat. Take GIA’s first sighting of a natural/lab-grown composite diamond with a fancy colored grade, which was first announced at the U.S. Jewelry Council forum on undisclosed lab-grown diamonds last week.
According to a GIA Lab Note published on Monday, the 0.33 ct. diamond was first graded fancy blue at the GIA’s New York laboratory. But what caught scientists’ attention was it had both nitrogen and boron defects. It is rare to see boron defects in a natural diamond—and even rarer to find both types of defects in one stone.
Further examination showed something else quite unusual: The stone was both type Ia and IIb diamond, another rare combination. (In fact, GIA reports running across that combo only once before, in 2009.) Finally, the truth was discovered. This was a colorless natural diamond with a small CVD coating on top. That coating gave it a fancy blue color when viewed from the table.
While the GIA note mentions that composites have been produced before, this is apparently the first composite GIA has discovered submitted (undisclosed) to its lab. This raises the possibility of more in the wild. This obviously is a troubling discovery—though someone with knowledge of the issue said at last week’s forum that he believes that GIA’s devices would be able to spot it.
Another lab exec told me producing these composites is likely not easy, or cheap, to do. But this will clearly be something to watch (and watch out for) in the future.
Source: jckonline.com

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Transparency in diamond, What is it?

Transparency, also called pellucidity, is the material property of allowing light to pass through. In mineralogy, another term for this property is diaphaneity.
The DCLA Transparency Grade is the degree to which a diamond transmits light, directly relevant to its ‘cloudiness’ or ‘haziness.’
In other words, it is a comprehensive assessment of light performance based on the quality of the diamond crystal itself.

What affects Transparency See:

DCLA Transparency Grade

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Christie’s to Offer 92ct. Pendant

A 92.15 carat diamond pendant worth up to $20 million will lead Christie’s Magnificent Jewels auction in Geneva next month.

The heart shaped, D colour, flawless diamond is the centerpiece of La Légende, a diamond and pearl necklace by designer Boehmer et Bassange.
The stone is the largest of its shape, color and clarity ever to be put up for auction, according to Christie’s.
Another Boehmer et Bassange piece, a pair of chandelier ear pendants titled La Vie Bohème, will also be on offer, with an estimated value of $2 million to $3 million.
Each earring consists of an asymmetrical pink diamond bow, a pear shaped diamond connecting link, and a marquise cut, D colour, flawless diamond weighing just over 10 carats, Christie’s said.
Source: Diamonds.net

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