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A face-up view of a cushion cut diamond with blue color.

Article

Gems & Gemology’s 7 Most Unusual Encounters from 2019

Stuart Overlin, Brooke Goedert and Kellie Giordano, December 13, 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

Article

Is There a Difference Between Natural and Laboratory-Grown Diamonds?

Russell Shor, May 31, 2019

Learn about the differences – and similarities – between natural and laboratory-grown diamonds, and how GIA’s researchers and grading laboratories can tell the difference

LCM reveals traces of catalyst and step-like growth marks.

Observation of Etched Surface Micro-Features on HPHT Synthetic Diamonds Using Laser Confocal Microscopy

Xuxu Wu, Taijin Lu, Shi Tang, Jian Zhang, Zhonghua Song, Hua Chen, Jie Ke, and Mingyue He, August 9, 2018

Laser confocal microscopy, a very reliable method of revealing surface micro-features, is used on an HPHT synthetic diamond to reveal growth structures.

This 15.32 ct cushion modified brilliant is the largest HPHT synthetic diamond graded by GIA.

15 Carat HPHT Synthetic Diamond

Sally-Eaton Magaña and Troy Ardon, August 9, 2018

A synthetic diamond seen in the Carlsbad lab is the largest faceted lab-grown diamond examined by GIA.

Within a parcel of 1,102 diamond melee, 1,092 were identified as HPHT synthetics.

One Natural Melee Diamond Found in Large Batch of HPHT Synthetic Melee

Stephanie Persaud, Wuyi Wang, Paul Johnson, and Ivana Petriska Balov, August 9, 2018

A single natural diamond is found within the largest percentage of undisclosed synthetic melee submitted to GIA.

Three Irradiated CVD Synthetic Diamonds

Sally Eaton-Magaña, August 9, 2018

Irradiated CVD-grown diamonds are examined in the Carlsbad lab.

Features of Synthetic Diamonds

Sally Eaton-Magaña and Christopher M. Breeding, August 6, 2018

Presents a visual guide to the growth processes and major gemmological spectroscopic features of synthetic diamonds.

Inclusions in Natural, Synthetic and Treated Ruby

Nathan D. Renfro, John I. Koivula, Jonathan Muyal, Shane F. McClure, Kevin Schumacher, and James E. Shigley, January 26, 2018

Provides a visual guide to the internal features of natural, synthetic and treated rubies.

Drilled natural pearls examined in this study.

Saltwater Pearls from the Pre- to Early Columbian Era: A Gemmological and Radiocarbon Dating Study

Chunhui Zhou, Gregory Hodgins, Todd Lange, Kazuko Saruwatari, Nicholas Sturman, Lore Kiefert, and Klaus Schollenbruch, November 8, 2017

Examines 85 saltwater natural pearls, reportedly harvested from the Caribbean islands off the coast of Venezuela during the early 16th century, to determine their age.

A blue synthetic star sapphire from past production of Wiede’s Carbidwerk

Synthetic Star Sapphires and Rubies Produced by Wiede’s Carbidwerk, Freyung, Germany

Karl Schmetzer, H. Albert Gilg, and Heinz-Jürgen Bernhardt, November 8, 2017

Details the process used by Wiede’s Carbidwerk to produce star synthetic corundum from the mid-1950s until the 1970s.

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