Article Search Results

Show Filters

Showing 137 results for "*"

Types

Articles (137)

Content Type

Lab Notes (36) Gem News International (27) Reviews (8) Abstract (12) Feature (3) Micro-World (4)

Reviewed

Peer Reviewed (19)

Topics

See All Topics

Gemstones

Pearl (67) Diamond (7) Sapphire (4) Emerald (3) Ruby (3) See All Gemstones

XClear Selections

Dr. E. J. Gübelin Collection Peridot

Article

GIA's Gübelin Gem Project: Various Gems, Olivine - Rutile

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

Read More

Dr. E. J. Gübelin Collection Kornerupine

Article

GIA's Gübelin Gem Project: Various Gems, Kornerupine - Natrolite

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

Read More

Dr. E. J. Gübelin Collection Danburite

Article

GIA's Gübelin Gem Project: Various Gems, Danburite – Humite

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

Read More

Gubelin Cordierite - Iolite 34802 300x169

Article

GIA's Gübelin Gem Project: Various Gems, Barite - Cuprite

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

Read More

Dr. E. J. Gübelin Collection Apatite

Article

GIA's Gübelin Gem Project: Various Gems, Amblygonite - Axinite

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

Read More

Figure 1. This 1.27 ct white semi-baroque pearl exhibited a typical platy structure when examined under magnification. Photo by Lhapsin Nillapat.

Tubular Feature in a Natural Pearl

Ravenya Atchalak and Emiko Yazawa, January 26, 2024

Investigation of a tubular feature in a natural pearl reveals evidence of parasitic activity.

Read More

Figure 1. This antique Indian-style headdress is decorated with handwoven light cream and cream-colored seed pearls. Photo by Gaurav Bera.

Seed Pearls in an Antique Indian-Style Headdress

Roxane Bhot Jain, Jayesh Surve, Abeer Al-Alawi, and Chunhui Zhou, January 26, 2024

GIA’s Mumbai laboratory analyzes seed pearls decorating an Indian-style headdress.

Read More

Figure 1. <em>Pinctada radiata</em> shell with a natural blister pearl measuring approximately 11.39 × 9.31 × 8.69 mm. Photo by Gaurav Bera.

An Unusual Partially Non-Nacreous Pinctada radiata Natural Blister Pearl

Abeer Al-Alawi, Lubna Sahani, Karan Rajguru, and Roxane Bhot Jain, January 26, 2024

A large Pinctada radiata natural blister pearl displays a unique reaction under long-wave ultraviolet light.

Read More

Eight European natural freshwater pearls from Margaritifera margaritifera mussels.

Natural Freshwater Pearls from Europe: Russia, Scotland, and Germany

Artitaya Homkrajae, Ziyin Sun, Elisabeth Strack, and Sally Chan Shih, September 3, 2021

Analysis of eight European freshwater pearls of known provenance gives pearl specialists the opportunity to add greatly to GIA’s identification database.

Read More

Freshwater bead cultured pearl necklace.

Vaterite Found on a Strand of Freshwater Cultured Pearls

Sally Chan Shih, January 28, 2022

An unusual formation of vaterite was identified on the surface of numerous freshwater cultured pearls throughout a single strand.

Read More

Load More