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A History of Diamond Treatments

In: The Global Diamond Industry

Author

Listed:
  • Thomas W. Overton

    (Access Intelligence)

  • James E. Shigley

    (GIA)

Abstract

Although various forms of paints and coatings intended to alter the color of diamond have likely been in use for almost as long as diamonds have been valued as gems, the modern era of diamond treatment—featuring more permanent alterations to color through irradiation and high-pressure, high-temperature (HPHT) annealing, and improvements in apparent clarity with lead-based glass fillings—did not begin until the 20th century. Modern gemologists and diamantaires are faced with a broad spectrum of color and clarity treatments ranging from the simple to the highly sophisticated, and from the easily detected to the highly elusive. The history, characteristics, and identi fication of known diamond treatments are reviewed.

Suggested Citation

  • Thomas W. Overton & James E. Shigley, 2008. "A History of Diamond Treatments," Palgrave Macmillan Books, in: Roman Grynberg & Letsema Mbayi (ed.), The Global Diamond Industry, chapter 7, pages 181-228, Palgrave Macmillan.
    • Handle: RePEc:pal:palchp:978-1-137-53761-4_8
    DOI: 10.1057/9781137537614_8
    as

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