Tag: gemstone enhancements

A heated question: What Canadian jewellers should know about tanzanite

August 1, 2013

When tribesmen in Tanzania first presented violet crystals to trader Manuel de Souza in 1967, he didn't realize what they'd discovered was a new gemstone. Instead, he believed he was looking at unusually coloured sapphires.

Colour blind: The challenges of grading and valuing coloured gemstones in today’s market

February 1, 2013

The 'advances' in the business of altering gemstones are moving far more rapidly than our ability to detect and/or understand them. By the time knowledge of any specific treatment is widespread, there is often an 'improved' version of that technique or something totally different in the market.

How experience and close observation can save you money

February 1, 2013

Experience and keen perception are a must in the jewellery industry. Since the scale of the object is most often very small, this is a good place to start training the eyes to see things that can truly make a difference in value and price.

GIA warns of colour-enhancing glue

August 16, 2010

Adhesive-set gemstones have caught the attention of the Gemological Institute of America (GIA).

Coloured gemstone groups unite in disclosure codes

March 15, 2010

The industry's three major coloured gemstone organizations have adopted a uniform set of codes to describe gemstone treatments.

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Others

Tag: gemstone enhancements

Revised AGTA code of ethics stresses transparency

A heated question: What Canadian jewellers should know about tanzanite

Colour blind: The challenges of grading and valuing coloured gemstones in today’s market

How experience and close observation can save you money

GIA warns of colour-enhancing glue

Coloured gemstone groups unite in disclosure codes

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Tag: gemstone enhancements

Revised AGTA code of ethics stresses transparency

A heated question: What Canadian jewellers should know about tanzanite

Colour blind: The challenges of grading and valuing coloured gemstones in today’s market

How experience and close observation can save you money

GIA warns of colour-enhancing glue

Coloured gemstone groups unite in disclosure codes

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