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These 0.28–0.67 ct CVD-grown diamonds displayed intense pink colourations, and were colour-graded as Fancy Intense to Fancy Vivid pink or purplish pink. The samples were produced using “standard production techniques” at Apollo for this type of stone.

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CVD-Grown Pink Diamonds

Wuyi Wang

An examination of seven CVD synthetic diamonds with an attractive pink colour.

Under the strong UV radiation of the DiamondView, the carbonado samples displayed regions of either green or orange to red fluorescence.

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Photoluminescence Features of Carbonado Diamonds

Wuyi Wang, Ren Lu and Tom Moses, July 21, 2009

Reports on the photoluminescence features of three faceted carbonado diamonds and proposes some constraints on the geologic conditions of their formation.

Microscopic examination of this 0.21 ct pink diamond shows a cluster of well-crystallised coesite inclusions. This diamond shows characteristics typical of Argyle diamonds. Raman microspectroscopy was used to identify all the included crystals as coesite.

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Coesite Inclusions: Microbarometers in Diamond

Ren Lu, November 13, 2009

Microscopic and spectroscopic examination of a suite of pink diamonds revealed inclusions of the mineral coesite, offering insight into their chemical and physical history.

This 2.14 ct “Fancy red” oval-cut diamond was produced through a multi-step treatment process.

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Treated Fancy Red Diamond

Paul Johnson and Christopher M. Breeding, June 15, 2009

Examines a 2.14 ct oval-cut diamond, graded as Fancy red, whose red colour was produced through a combination of high-presssure, high-temperature (HPHT) treatment and irradiation plus annealing.

Image taken in Carlsbad using the new L-Box for one of GIA’s research diamonds. The L-Box environment creates a good replication of how a diamond is viewed in real life.

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New Tool for Diamond Appearance Research

Al Gilbertson and Ilene Reinitz, June 13, 2012

The L-Box™ can be used to compare the appearance of two or more diamonds, or fitted with a camera to capture a series of photos while the objects are moving. The images can be combined to build a high-resolution or 3D video.

$These round brilliant diamonds have small areas on the pavilion etched with diffraction gratings that increase their apparent fire.$

Article

Study of New Method for Adding Fire to Diamonds

Al Gilbertson, October 27, 2009

Previews a forthcoming study on the placement of diffraction gratings on a diamond's surface to increase the appearance of fire.

This 1.49 ct pear-shaped brilliant was graded Fancy Deep brown orange.

Article

Detecting Irradiation-Induced Defects in a Brown-Orange Diamond

Sally Chan and Paul Johnson, October 8, 2010

Reports on a diamond that displayed strikingly different fluorescence behaviour between the table and pavilion facets, a clear indication of irradiation.

This 0.88 carat synthetic nano-polycrystalline diamond was grown using a multi-anvil press by a new sintering process and faceted into a round brilliant stone.

Article

Transparent, Faceted Nano-Polycrystalline Synthetic Diamond

Elise A. Skalwold, Nathan Renfro, Christopher M. Breeding and Jim Shigley, July 25, 2012

A preliminary examination of a new highly transparent synthetic diamond material not produced by CVD or traditional HPHT diamond synthesis methods.

Infrared mapping data of an HPHT-grown synthetic diamond wafer.

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Infrared Microscopy Applications

Ren Lu, January 9, 2013

Explores the usefulness of this technique in the mapping of defects and spectral features, the determination of colour origin, and the identification of synthetic and treated diamond melee.