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Article

How Do I Know if the Fancy Melee in My Jewellery is Natural Diamond?

Amanda J. Luke, September 18, 2020

Find out about how GIA is addressing industry concerns over undisclosed laboratory-grown and simulated fancy melee being mixed in with natural fancy melee.

Article

Instruments revolutionise gem identification process

, February 4, 2013

An overview of how GIA's instrument development has helped gemmologists to identify gemstones

A large group of people outside on GIA’s Carlsbad, California campus.

Article

Guardians of Trust: GIA’s Innovative Research, Instruments and Services

Russell Shor, September 20, 2019

GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.

A woman sits in front of a computer screen with the DiamondView to her right.

Article

Inside De Beers’ Lightbox Diamonds

Russell Shor, March 18, 2019

GIA researcher analyses and confirms that De Beers’ Lightbox diamonds are grown using the chemical vapour deposition process.

Real-Time Microradiography of Pearls: A Comparison Between Detectors

Stefanos Karampelas, Abeer Tawfeeq Al-Alawi, and Ali Al-Attawi, January 26, 2018

Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).

Figure 1. One of GIA’s new LA-ICP-MS corundum calibration standards sets (set number 1); the epoxy disk containing the set is 1.5 inches in diameter. NIST SRM 610 and 612 glass standards are included to account for trace and non-trace elements, such as those found in inclusions, that were not incorporated into the synthetic sapphire crystals grown for standards. Photo by Jennifer Stone-Sundberg.

Accurate Reporting of Key Trace Elements in Ruby and Sapphire Using Matrix-Matched Standards

Jennifer Stone-Sundberg, Timothy Thomas, Ziyin Sun, Yunbin Guan, Zachary Cole, Randy Equall, and John L. Emmett, January 26, 2018

Presents a group of corundum standards developed by GIA to improve the accuracy and efficiency of its laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) instruments.

Emerald crystals from Colombia, Afghanistan, and Zambia

Photoluminescence Spectra of Emeralds from Colombia, Afghanistan and Zambia

D. Brian Thompson, Christian J. Bayens, Matthew B. Morgan, Taylor J. Myrick, and Nealey E. Sims, November 8, 2017

Compares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.

Sapphire Chart Article: Suggested Reading on Sapphires and Their Inclusions

, August 7, 2017

Suggested Reading on Sapphires and their Inclusions

Fluorescence produced by optical defects in diamond: measurement, characterisation and challenges

Yun Luo, July 24, 2013

How variations in UV lamp output can affect observed fluorescence colour and intensity.

Evan Smith studies images of diamond inclusions on a computer.

Article

Postdoctoral Programme Gives Scientists Access to Rare Research Opportunities

Amanda J. Luke, November 16, 2016

GIA’s postdoctoral programme gives researchers access to gemmological data, equipment, and rare, unusual and large gems in its laboratories.

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