Scottish Gemmological Association


Sunday, 30th April, 2017

Our Sunday afternoon workshops are always popular and places are limited for some of them, so we always recommend that you choose and book your options as soon as possible.  

You can select from five different workshops in each session, with durations ranging from one to two hours.  We ask that you rank your choices for each session by preference, just in case your first choice workshop has no more spaces available.


SESSION 1, all finishing by 3.15p.m

1.15p.m start: 

Tom Herbst and Kath Duncan:  Cutting and Setting, 1.5 to 2 hours, 1st session

Tom and Kath will be making individual short presentations on their workbench skills followed by a joint discussion, hopefully driven by questions from the workshop participants, on their craft and and the interfaces and overlaps between their specialities.


Alan Hodgkinson:  Green Stones, 1.5 to 2 hours

Obviously emerald will feature largely in the workshop specimens for handling and testing and this will include natural, synthetic, composite and simulant. As with a previous yellow gem workshop, colour photos will accompany each specimen so that the delegates can see the point of interest integral to the stone. The photo itself may provide sufficient interest, but additionally, in some cases, the delegate is pointed to a particular test or piece of equipment (loupe, microscope, filter, UV light etc) which will further explore the properties or behaviour of the gemstone. Such equipment will be provided at that point. However it is asked that delegates provide their own loupes as a minimum.

The image below shows a new Chinese synthetic emerald which will be featured.

- and a green sphene.


Antoinette Matlins:  Gemstone Treatments May Be OK, but non-disclosure is NOT - and what does 'disclosure' really mean!  1.5 to 2 hours

This presentation would be a lecture followed by a discussion with attendees on their points of view, experiences etc, in an effort to articulate a 'position' on treatment.

It would include a discussion of such things as:

  • whether or not the extensive use of treatments today, on an ever-increasing number of gemstone materials, is a good or bad thing for the industry
  • whether or not treatments are being disclosed at the counter, and if so, whether or not their representations are accurate and reliable
  • whether or not the presence of both treated and untreated material is leading to both trade and consumer confusion
  • whether or not the routine use of treatments is affecting demand for, and value of, natural, untreated gemstones and if those 'values' are really reflective of FULL DISCLOSURE
  • whether or not it is necessary to differentiate between those 'treatments' that produce permanent results and those that do not
  • whether or not these types of treatment must be disclosed, along with the 'degree of treatment' and what the trade can do to ensure that such information will actually be disclosed.


Andrew Fellows:  Beyond the Normal, 1½ hours

A chance to see both the usual and the unusual.  Everyday gems with unusual inclusions or features sit alongside the more unusual or rarely seen gems in this hands-on practical workshop.


2.15p.m start

David Callaghan:  The Worshipful Company of Goldsmiths

The Goldsmiths’ Company of London – 5th in the Great Twelve listings – has a unique place in the history of this country. For over 700 years the Company has been responsible for the testing and hallmarking of gold, silver, platinum and now palladium, one of the oldest forms of consumer protection in the world.


BREAK FOR COFFEE   3.15 - 3.45p.m


SESSION 2, all starting at 3.45p.m

Tom Herbst and Kath Duncan:  Cutting and Setting, 1.5 to 2 hours

         as for Session 1

Alan Hodgkinson:  Green Stones, 1.5 to 2 hours

as for Session 1

Cigdem Lule:   Change of Topic now Archaeogemmology, 1.5hr

This presentation aims to provide a detailed introduction to archaeogemmology and will discuss details of how gems were interpreted and traded by the ancient civilizations from a mineralogist point of view. Cigdem will explain how researchers from different disciplines are cooperating in order to gain an understanding of the ancient societies through their use of gems. This is also an additional perspective on how to utilize gemology in the investigation of ancient gems. Today’s practicing gemmologist and valuer will have a better understanding of how gems and minerals have been used in different eras by presenters’ real life examples.

Andrew Fellows:  Beyond the Normal, 1.5hr

as for Session 1

Antoinette Matlins:  Pocket Sized Tools Revisited:  Valuable, Time-Saving Uses Still Useful For The Gemmologist, 1.5 to 2 hours