News & Articles

A row of five low-quality bead cultured pearls.

A Study on Improving the Surface Appearance of Low-Quality Pinctada maxima Bead Cultured Pearls

Nanthaporn Nilpetploy, Kwanreun Lawanwong, Promlikit Kessrapong, Areeya Manustrong and Nicholas Sturman, March 24, 2021

In this study, the Bangkok laboratory examined five low-quality bead cultured pearls sourced directly from a local pearl factory and characterised their features before and after processing.

A white and purple pearl sitting in half of its shell.

Clam Chowder with a Side of Pearl

Phoebe Shang, January 15, 2021

Recently, staff in GIA’s New York laboratory were astounded by two natural pearl finds on opposite coasts – one in Baja California, Mexico and one in Long Island, New York. Each find was outstanding and worthy of exploration.

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.

A small house, left, and a treehouse, right, are lit up against a star-filled sky.

GIA’s Knowledge Sessions: A New Way to Share Gemmological Information

Amanda J. Luke, August 17, 2020

GIA Knowledge Sessions cover a variety of gemmological topics and provide an opportunity for researchers, retailers, designers and other jewellery lovers to learn in a friendly, more casual format.