Introduction to Diamond Grading

Instructors: Alexei Shalyshkin, FCGmA, DGA and Jurie Wessels, FGA

Two days, 9am - 4pm

Registration Fee:  $450.00 per person plus applicable taxes.
10% discount to CJA members.
No prerequisite required for attending.


E-mail [email protected] for further information and registration.

WORKSHOP CONTENT:

DAY ONE :

Carat weight
The introduction of the metric measurement.
Estimating the carat weight of diamonds by
measurement and formulas, estimation of mounted stones

Clarity
How clarity affects appearance and durability.
How clarity grading affects values.
Explaining clarity scale and description of each grade, including SI3 grade.
Explaining clarity types, ie. inclusions and blemishes.
Finding major inclusions in stones which set the grade of the Diamond.
Examining the stone for surface characteristics.

PRACTICAL WORKSHOP

DAY TWO :

Colour
International grading systems, GIA, CIBJO, EGL
Fluorescence
Using Master Stones to grade colour.
Grading colour in loose stones.
Grading colour in mounted stones.

Cut
The Round Brilliant cut - facets and angles - how this cut affects appearance.
Old European cut - how this cut affects appearance.
How cut in general affects apearance - reflection and refraction.
Explaining the cut grade, ie. symmetry, proportion, table size, etc.

PRACTICAL WORKSHOP, TWO STONE TEST

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Informative Articles

Informative Articles

To keep you abreast of new discoveries in gemstone research, synthetics and treatments, we have listed a selection of informative articles written by experts in their field. Check this page regularly for updates.

Read More

"European Gemological Laboratory Defines SI3"

Adding the SI3 clarity grade to the grading system was the next logical step.

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'The Scoop on synthetics'

Can we ID them? Should we grade them? Do we need them?

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'Cultured Confusion'

Should a man-made diamond be called "synthetic", or "cultured" and who are the important players in this controversial addition to the diamond industry?

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"A Gemological Study of A Collection of Chameleon Diamonds"

The rarity of chameleon diamonds and their interest for the connoisseur are due to their unusual ability to change color temporarily when heated to about 150C, or after prolonged storage in the dark.

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"Interpreting Diamond Morphology" - Part I

A diamond's morphological features reflect conditions of diamond formation and represent a unique characteristic than can be used to identify details of the sources of diamonds.

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"Interpreting Diamond Morphology" - Part II

Morphological features reflect conditions both during diamond formation and also after emplacement, especially where alluvials are concerned.

Read More