Article Search Results

Types

Articles (64)

Content Type

Gem News International (64)

Reviewed

Topics

Colour (1) Optical Properties (1) See All Topics

Gemstones

See All Gemstones

XClear Selections

These two opals were represented as natural-color blue and pink opal from Mexico.

Update on Dyed Hydrophane Opal

Edward Boehm and Nathan Renfro, January 26, 2018

Opal purportedly from a new deposit is found to be dyed.

New Designs from Paula Crevoshay

Andrew Lucas and Tao Hsu, May 8, 2017

World-renowned jewellery artist Paula Crevoshay displays some of her newest pieces at the Tucson gem shows.

Australian Opal Beads with Blue Play-of-Colour

Donna Beaton, August 3, 2016

Boulder opal in sandstone matrix is seen as beads in Tucson.

Jewelry Television in Tucson

Tao Hsu and Andrew Lucas, April 28, 2016

A look at JTV’s history, current activities and impact on the industry.

Thai-Myanmar Petrified Woods

Seriwat Saminpanya, November 23, 2015

The properties of petrified woods originating from various localities in Thailand and Myanmar are examined.

New Deposit of Black Opal from Ethiopia

Lore Kiefert, Pierre Hardy, Tewodros Sintayehu, Begosew Abate, and Girma Woldetinsae, January 30, 2015

The Stayish mine in Ethiopia’s Wollo province has been producing black opal since 2013.

Coated Fire Opal in the Chinese Market

Wen Han, Taijin Lu, Hua Chen, and Jian Zhang, October 31, 2014

An investigation of a coated fire opal recently found in the Chinese market.

Large Oolitic Opal Block

Nathan Renfro, April 30, 2014

The natural-colour oolitic opal is the largest of its type examined by GIA.

Rhyolite matrix containing opal-filled cavities

Mexican Fire Opal – Tucson 2014

Duncan Pay, April 30, 2014

Fire opal production at a family-owned mine in Mexico is explored at the 2014 GJX show in Tucson.

Water Immersion Reveals Dye in Fire Opal

Larry Tai-An Lai, October 17, 2013

A simple test easily detected dye treatment in fire opal.

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Gemstones

Find a Retailer

Visit the campus shop

Subscribe to Knowledge Rocks Emails

G&G Spring 2021 Edition