Showing posts with label origin. Show all posts
Showing posts with label origin. Show all posts
Monday, October 21, 2019

Is It Really Possible To Know Where Your Jewelry Comes From?

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The problems are region-specific. Honestly, there are no easy solutions. Useful link: https://www.jckonline.com/editorial-article/possibl...
Monday, October 07, 2019

Origin Determination Of Gemstones

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Gubelin and the GIA are the best sources for origin determination. Useful link: https://www.gubelingemlab.com/en/gemlab/reference-coll...
Sunday, January 14, 2018

Precious Gems Bear Messages From Earth’s Molten Heart

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Spot on. Useful link: https://www.nytimes.com/2017/12/11/science/gemstones-diamonds-sapphires-rubies.html
Saturday, February 13, 2016

An Ethical Debate Concerning ‘Pigeon’s Blood’ Rubies And ‘Royal Blue’ Sapphires From Diverse Origins

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A must read. Useful link: http://gemresearch.ch/an-ethical-debate-concerning-pigeons-blood-and-royal-blue-for-corundum-from-diverse-origi...
Friday, February 05, 2016

Origin Determination Of Dolomite-Related White Nephrite Through IB-LDA

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A must read. Useful link: http://www.gia.edu/gems-gemology/fall-2015-dolomite-related-white-nephrite-iterative-binary-linear-discriminant...
Sunday, May 04, 2008

Paraiba Tourmaline Controversy

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David Federman writes about the pros and cons with the origin name Paraiba + provenance issues and the impact @ http://www.colored-stone.com...
Tuesday, April 22, 2008

Origin, Ceylon Sapphire

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I think the initiative by the Sri Lankan Gem & Jewelry Association to promote their colored stones, especially sapphires is a great idea...
Tuesday, May 22, 2007

A Question Of Origin: A Different View

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(via Gemological Digest, Vol.3, No.1, 1990) Charles A Schiffman writes: Relating a source to the presence of certain inclusions or other phy...
Monday, May 21, 2007

A Question Of Origin: A Different View

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2007: Here is an interesting perspective on the question of origin from the father of inclusion studies. (via Gemological Digest, Vol.3, No....
Friday, May 18, 2007

A Question Of Origin: A Different View

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(via Gemological Digest, Vol.3, No.1, 1990) Grahame Brown writes: Your well documented arguments against using origin reports to support pri...
Thursday, May 17, 2007

A Question Of Origin

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2007: I think John Koivula was right. The laboratories have no need for origin, and in some cases there is no way of knowing where the stone...

Inclusions As Criteria In Gemstone Origin Reports

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2007: The amazing thing is despite the limitations, the trade still insists for origin certification and a few gem testing laboratories are ...
Friday, May 11, 2007

Reliability Of Origin Determination For Gemstones

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(via Gemological Digest, Vol.3, No.1, 1990) Dr Henry A Hanni writes: Definition: Origin = geographical place where a gemstone is situated. T...
Thursday, May 10, 2007

Reliability Of Origin Determination For Gemstones

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(via Gemological Digest, Vol.3, No.1, 1990) Dr Henry A Hanni writes: Definition: Origin = geographical place where a gemstone is situated. T...
Monday, April 30, 2007

Origin Determination Of Rubies, Sapphires And Emeralds

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The lecture was delivered on the 8th December, 2004 at AIGS by Dietmar Schwarz and Christian Dunaigre, Gubelin Gem Lab, Switzerland. In brie...
Saturday, December 02, 2006

Geographic Origin on Emerald Identification Reports

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GIA writes: The Gemological Institute of America (GIA) begins offering geographic origin determinations on its Emerald Identification Repor...