Article Search Results

Show Filters
Showing 2576 results for "*"

Types

Articles (2576)
XClear Selections
A row of five low-quality bead cultured pearls.
Article
A Study on Improving the Surface Appearance of Low-Quality Pinctada maxima Bead Cultured Pearls

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.

Read More

A white and purple pearl sitting in half of its shell.
Article
Clam Chowder with a Side of Pearl

Recently, GIA’s laboratory in New York had the opportunity to examine a fascinating pearl find and hear about an even more fascinating story.

Read More

Sorting melee on white background
Article
How Do I Know if the Fancy Melee in My Jewellery is Natural Diamond?

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

Read More

A small house, left, and a treehouse, right, are lit up against a star-filled sky.
Article
GIA’s Knowledge Sessions: A New Way to Share Gemmological Information

Webinars are an easy, informal way for GIA experts to share information and stay connected with the community of researchers and gem and jewellery lovers.

Read More

A notebook, pen, mobile phone with compass app and a digital camera sit on top of a map.
Article
The Stories Behind the Photos: A Gigantic Aquamarine and ‘Gaudy’ Nature

Gemmological photojournalist Robert Weldon shares the stories behind some of his favourite photos.

Read More

The symbol of medicine, the caduceus (wings on each side of the top of a staff with two snakes intertwined around it) stabbing thru the coronavirus. A garnet sits at the top of the staff.
Article
Jeweller Creates ‘Medal of Honour’ Brooch to Recognise Coronavirus Healthcare Fighters

GIA graduate Franco Valobra creates a commemorative brooch to recognise healthcare workers on the front line of the coronavirus battle for survival.

Read More

Two blue sapphires side by side
Article
G&G Announces Most Valuable Article Awards

G&G announces the winners of the Dr Edward J. Gübelin Most Valuable Article Awards for 2019.

Read More

Man stands at a podium in front of a room of people.
Article
What Country Do My Diamonds and Other Gemstones Come From?

Dr James Shigley shares how GIA determines coloured stone origin and the mysteries of diamond origin.

Read More

Three round brilliant diamonds in a row
Article
GIA Researchers Evaluate ‘Light Performance’ and Diamond Cut

The phrase “light performance” gets a lot of loose use in the diamond trade, but what does it mean when someone is actually looking at a diamond?

Read More

Man stands in front of an audience giving a lecture – projection screen with image to his right.
Article
Not All That Glitters is Gold — Sometimes it is Mozambican Rubies

Learn about Mozambican rubies, including their mining history, characteristics and market demand.

Read More