Article Search Results

Show Filters
Showing 3 results for "*"

Types

Articles (3)

Content Type

Lab Notes (1) Feature (1)

Reviewed

Peer Reviewed (1)

Topics

See All Topics

Topics

Inclusions (3)
Gemmology (2)
History (2)
Localities (2)
Physical properties (2)
Assembled Stone (1)
Colour (1)
Enhancement (1)
Geology (1)
Identification (1)
Jewellery (1)
Mining (1)
Optical effects (1)
Optical Properties (1)
Synthesis Process (1)
Synthetics (1)

Gemstones

See All Gemstones

Gemstones

Moonstone (3)
Sapphire (3)
Alexandrite (2)
Garnet (2)
Pearl (2)
Ruby (2)
Diamond (1)
Diamond - Fancy ColoUr (1)
Emerald (1)
Iolite (1)
Opal (1)
Spinel (1)
Topaz (1)
Tourmaline (1)
Zircon (1)
XClear Selections
Three pieces of labradorite with yellow, blue and green flashes of color.
Article
Optical Effects of Phenomenal Cabochons

Sharon Bohannon, November 11, 2016

Learn how the structure, inclusions and properties of some gemstones interact with light to create unusual visual effects.

Read More
Confusing, Triangular Inclusions in an Art Deco-Style Pin
Spring 1991 G&G Lab Notes

March 1, 1991

This section, from the Spring 1991 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

Read More
Sri Lanka: The Gem Island

Peter C. Zwaan, June 1, 1982

An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.

Read More

Resources For Retailers
Find a Retailer
learn more
Shop the Campus Store
Visit the campus shop
Learn More
Abstract art with a fluorescent rainbow and dark brown triangle patterns
Subscribe to Knowledge Rocks Emails
Learn More
The internal structures of natural pearls from the marine mollusk Pinctada maxima are the subject of the lead article in this issue. The scattered loose pearls on the cover are from Paspaley’s natural pearl collection, which includes one discovered in the 1970s at the Eighty Mile Beach fishing grounds
G&G Spring 2021 Edition
Learn more