"The Indian Blue," a 7.55 carat fancy deep grayish-blue diamond, will be the top lot at Sotheby's Magnificent Jewels sale in New York City today. Described as the "property of a distinguished lady," the cushion-cut center stone has a SI2 clarity and is flanked by two shield shaped diamonds in a ring that carries a pre-sale estimate of $6 million to $8 million. Trace amounts of the chemical element boron are responsible for causing the coloration of natural blue diamonds. According to the Museum of Natural History, “less than one boron atom per million carbon atoms is sufficient to produce the blue coloration.” Also scheduled to hit the auction block at Sotheby's today is a ring featuring an ultra-rare 1.38 carat fancy red diamond. Fancy reds so rare that a typical Argyle Pink Diamonds Tender releases only four, or so, per year. Rio Tinto's Argyle Mine in Western Australia, the primary source of red and pink diamonds, is scheduled to cease operations in 2020, so supplies of these beautiful red diamonds are expected to become even more scarce.
Turkey's a-cookin' and candy cane sticks, With reindeer and sleigh bells and good old Saint Nick Two kids sneakin' kisses beneath all the mistletoe, As if we didn't know! This year, we shall know a wonderful Christmas And the glow of candlelight Let's have a fling! I'll give you my present, a wedding ring! Hear me sing.
December's birthstones have traditonally included turquoise, blue zircon and blue topaz. Tanzanite, the newest gemstone for December was added in 2002. Between its deep blue color and its limited supply, tanzanite is treasured by many, even if your birthday is not in December. It was in the late 1960s when the marketing team at Tiffany & Co. got its first peek at a stunning new gemstone. The intense blue-violet gem had been discovered in the foothills of Mount Kilimanjaro in Tanzania by a Maasai tribesman named Jumanne Ngoma. At first glance, the specimens appeared to be sapphires, but the Gemological Institute of America revealed that the crystals were a never-before-seen variety of zoisite.
We blogged at an earlier date about this rare diamond duo. Russia’s Alrosa diamond mining company announced Thursday that the curious "diamond in a diamond" revealed on social media in early September has been added to its collection of rare finds and is not for sale, which is why we say "priceless". In early September, Alrosa surprised its Instagram followers with a video that seemed to show a tiny rough diamond moving freely in the cavity of a larger one. The caption read, “A diamond in a diamond? We couldn’t help but share this very special find with you.” At the time, Alrosa wasn’t quite sure what to make of the phenomenon. Nobody at the mining company had ever seen anything like it. Five weeks later, Alrosa scientists confirmed that both the host and smaller crystal were diamonds. They named the double-diamond “Matryoshka” because its strange configuration is reminiscent of the popular Russian nesting dolls. The specimen, which weighs only 0.62 carats, was discovered in Yakutia at Alrosa's Nyurba mining and processing division. Matryoshka joins Alrosa's ever-growing collection of diamond wonders. These include crystals that resemble a soccer ball, a Valentine heart, a skull and a fish. Interestingly, some of Alrosa's most unusually shaped diamonds have come to light at the most opportune times.