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    Jun 25

    Blue diamonds were recently sold at two separate auctions for millions of dollars, proving that colored diamonds are even more popular than their colorless equivalents are, which is something that many people don’t understand. Recently, a pear shaped blue diamond sold for $4.93 million at auction in Geneva, which set a new world record for price per carat for any gemstone ever sold. The diamond was rated fancy vivid, is mounted in platinum, and weighs 3.73 carats. This $1.33 million per carat exceeds the 1.32 million price per carat of the last large blue diamond that was sold in Hong Kong in 2007. A pink diamond sold to the same buyer for more than a million dollars. It weighed 6.62 carats.

    Another blue diamond was sold at another auction for 8.9 million. This sale was called the most important colored diamond sold at auction anywhere in the world during the last 10 years.

    An auctioneer said that the reason that the blue diamonds could fetch such high prices is because of the scarcity of colored diamonds on the market and the demand from collectors around the world.


    What exactly makes a diamond blue, pink, or yellow? How are they graded?

    Color grading scales used by the different internationally recognized organizations range from colorless to yellow and a number of other colors based on different factors. Impurities that are trapped into the diamond as it is forming, as well as exposure to radiation, and the internal crystal structure of the diamond are some major factors. The diamond grade is partly determined by the color and how bright or vivid that color is.

    Blue Diamonds

    Blue diamonds, like those sold in the above auctions, are created when some of the nitrogen gets replaced by boron, a substance that causes the blue light of the wavelength spectrum to be reflected. The more boron in the diamond, the color will be brighter and more vivid. The diamond above that was judged to be a fancy vivid would have been a very vibrant blue.

    Yellow Diamonds

    Diamonds take on a yellow appearance when impurities are trapped inside the stone while it is being created. The amount of color, the vividness, in a diamond, is determined in this case by how many nitrogen atoms are trapped in the diamond. This causes the yellow light on the spectrum to be reflected.

    Pink Diamonds

    These diamonds do not get their coloration, which can range from a light pastel to a dark rose, from impurities in the stone. They get their color from a process that is called plastic deformation, which is basically structural anomalies created during the crystal growth. The different pressures on the structure will cause the color of the stone to be different, either pale or bright.

    Green Diamonds

    The green color found in some rare diamonds is caused when a diamond is affected by a radioactive source during its creation. It can take a long time (more than a million years) to create a green diamond, which makes them quite the rarity and is sure to help drive their price upward.

    Black Diamonds

    There are only two known places in the world to find black diamonds: Central Africa and Brazil. They contain small amounts of nitrogen and hydrogen, and recent studies show that these diamonds may have started their formation as carbon dust and then fell to the earth as meteorites. If this theory proves true, the black diamonds would be the rarest diamonds in the world, and it brings whole new meaning to the ‘like a diamond in the sky’ lyric from the famous children’s song Twinkle, Twinkle Little Star!

    In general, the more vivid the color of any diamond, the more it is worth. However, the value of a diamond doesn’t have to do only with the color. They are judged and priced by something known as the 4 C’s, the color, cut, clarity, and carat. The carat has to do with how large the diamond is, judging the clarity means looking for imperfections in the diamond, the cut has to do with how the diamond was manufactured and the color, as already discussed, has to do with the brightness of the stone.

    With the colored diamonds being more rare than the colorless, many people are finding that they are good investment opportunities. This is true, if you can afford to buy something like a $5 million blue diamond, of course, but it may also be worth your while to invest in diamonds that aren’t quite so extravagant. They are more reliable than real estate and easier to transport than an item such as a painting or sculpture. They have the ability to retain their value after a disaster such as a fire as well – something that a painting or one of Da Vinci’s diaries certainly can’t do.

    4 Responses to “The Value of Colored Diamonds”

    1. Julie Ewens Says:

      Hi, I bought a black diamond in 2003 as a long term investment on the advice of jeweller. Details belows:

      “One Loose Gemstone: One round brilliant cut diamond, colour is “black”
      Dimension = 9.9mm (Dia) x 7.9mm (d-estimated)
      Total weight = 5.17ct
      Insurance Replacement Valuation AU$25,023.00

      Should I get this re-valued ie. has there been an increase in the demand for these diamonds.
      Julie Ewens
      Queensland Australia

    2. Dot Says:

      I have a Green-Yellow 1.15 carats, Intense, VS2, fancy colored diamond. It’s an Old European Cut, (cut in 1917), simply marvelous, and has strong green flour. The crazy thing about this diamond is, that it will turn completely White. I have a 6 month old GIA report and they’ve raved about this stone. The UV does crazy things to the diamond, but then it turns white. Is this a commond thing?

    3. khbgfth Says:


    4. jestric Says:

      thank you for this wonderful information about diamonds.. i wish i have one of this rare diamonds one day..

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