Tag: Mark T. Cartwright

The art of self-defence: Disclosures, disclaimers, and delusions

October 1, 2014

For more than two decades, I was a practitioner of the Japanese martial art of Aikido. The style I practiced was focused primarily on the purely defensive and harmonious blending of the 'attack' and 'response' energies. Most of the appraisers I know also practice some form of self-defence, at least in their appraisals.

Does a gemstone’s country of origin matter?

December 1, 2013

How often have you had a client carefully explain the ring they just bought has a Burmese ruby, or a Colombian emerald, Paraiba tourmaline, or Russian alexandrite?

Something seems amiss: Synthetic diamonds amongst us

August 1, 2013

Recent trade news reports of discoveries of undisclosed synthetic diamonds may be indicators of uncertain times ahead for the appraiser/gemmologist.

Zeroing in on diamond weight calculations

July 1, 2013

In the previous column, we looked at how tiny errors can add up to significant problems when dealing with many small stones. This time, we'll look at the calculations and adjustments that might be necessary when examining diamond centre stones.

Close enough?

May 1, 2013

As a professional appraiser, I pride myself on accuracy, clarity, and a defensible methodology. I believe what I'm doing and how I'm doing it is 'right.' Recent experiences have somewhat shaken my belief system, and I thought I'd share my concerns with the hope others finding themselves in any similar situations might benefit from my learning curve.

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.

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Tag: Mark T. Cartwright

The art of self-defence: Disclosures, disclaimers, and delusions

Does a gemstone’s country of origin matter?

Something seems amiss: Synthetic diamonds amongst us

Zeroing in on diamond weight calculations

Close enough?

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

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Tag: Mark T. Cartwright

The art of self-defence: Disclosures, disclaimers, and delusions

Does a gemstone’s country of origin matter?

Something seems amiss: Synthetic diamonds amongst us

Zeroing in on diamond weight calculations

Close enough?

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

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Popular Articles

Read the Latest Issue