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Article: Blue diamond

Blue diamond

Properties determining value of blue diamonds

  • Four Cs of Connoisseurship: color, clarity, cut, and carat weight
  • Color is the most important criterion for grading a blue diamond
  • Highest clarity grades increase the value of blue diamonds
  • No completely flawless blue diamonds, but some are graded Internally Flawless
  • The Hope Diamond is a famous blue diamond discovered in India
  • Clarity in blue diamonds is judged under 10x magnification
  • Clarity has little effect on the value of blue diamonds, except for vividly colored ones
  • High clarity on a vividly colored diamond can add tremendous value
  • Loupe standard is used to grade clarity in blue diamonds
  • Exceptional clarity can increase the value of blue diamonds

Color characteristics of blue diamonds

  • Blue diamonds occur in hues ranging from green-blue to gray-blue
  • Primary hue of blue diamonds is blue, with green and gray as secondary hues
  • Pure blue diamonds are considered the most beautiful and valuable
  • Type IIb blue diamonds have very few or no nitrogen impurities
  • Type Ia blue diamonds have a secondary hue and get their color from hydrogen

Treatments and value of blue diamonds

  • Natural blue diamonds are considered rare and valuable
  • Enhanced diamonds, which have had color added, do not have the same value
  • Synthetic blue diamonds can be created using the HPHT method
  • Enhanced blue diamonds are not bought for investment or resale purposes
  • Natural blue diamonds hold their value better than enhanced or synthetic ones

Blue diamond mines

  • The Hope Diamond was discovered in the Kollur mine in India
  • Blue diamonds have also been found in the Cullinan Mine in South Africa
  • The Golconda region is known for producing blue diamonds
  • The Argyle Mine in Western Australia occasionally yields blue diamonds
  • Blue diamonds are thought to form in the lower part of Earth's mantle

Additional information on blue diamonds

  • Blue diamonds are graded based on their color intensity, with the most intense blue being the most valuable
  • The Gemological Institute of America (GIA) provides grading and certification for blue diamonds
  • Blue diamonds are formed deep in the Earth's mantle under extreme pressure and temperature conditions
  • The presence of boron during the diamond's formation process gives it a blue color
  • Blue diamonds are often found in diamond mines located in countries like South Africa, Australia, and Botswana
  • Blue diamonds are considered rare, with only a small percentage of diamonds exhibiting a blue color
  • The Hope Diamond, Blue Moon diamond, Oppenheimer Blue diamond, Bunny Mellon's Blue Diamond, and Botswana's largest-ever blue diamond are famous examples
  • Synthetic blue diamonds are created in a laboratory using high-pressure, high-temperature (HPHT) or chemical vapor deposition (CVD) methods
  • The GIA has techniques to distinguish between natural and synthetic blue diamonds
  • Synthetic blue diamonds offer a more affordable alternative to natural blue diamonds

Blue diamond Data Sources

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