Scottish Gemmological Association

As ever, we are very grateful to our Sponsors for their continuing support of our annual Conference.


Gem-A is a registered charity. As the world's longest established provider of gem education, they are committed to promoting the study of gemmology and providing continuous professional to their members.

Established in Hatton Garden in 1984, Marcus McCallum specialises in supplying rare and unusual stones to the trade. They also have a constantly-changing stock of pearls and beads.

Marcus personally sources his stock from prime contacts around the world drawing on relationships with dealers and cutters forged over twenty-five years. Regular visits to Brazil, India and Sri Lanka ensure a constantly updated range of particularly fine and unusual stones. His extensive stock of freshwater pearls, especially selected in Hong Kong and the Far East, encompasses all shapes and colours whilst his range of semi-precious beads is one of the most exciting and wide-ranging in the UK.


Alistir Wood Tait is a jeweller and gemmologist, and has been prominent in Edinburgh's jewellery establishment for more than 30 years. His shop is a haven for lovers of beautiful things and the displays reflect the unique nature of Alistir's stock.  Each of his staff is a specialist in their own field and all bring their love and enthusiasm for gems and jewellery to their customers and clients.



W. Hamond jewellers/workshop is situated at the bottom of Whitby’s famous 199 steps and is the oldest manufacturers and retailers of Whitby Jet jewellery and ornaments in the world.

Opened in 1860, the original boutique was owned by James Storr, a name which can still be seen on the Victorian tiles that decorate the front of the shop.

Over generations, the name James Storr has evolved to become W. Hamond and the business is now recognised within Britain’s jewellery industry as being a leading innovator in design and manufacture. W. Hamond are also dedicated to the advancement and elevation of British gemstones and have twice won the Gemmological Association of Great Britain’s Gem Empathy Award, as well as featuring on a number of television programs including Michael Portillo’s Great Railway Journey’s, Ade in Britain, Britain at Low Tide and BBC’s Back to the Land, all of which explain the geology and history of Whitby Jet and demonstrate how it is crafted into award-winning jewellery.

Over the years, W. Hamond has acquired an unrivalled collection of antique Whitby Jet as well as the largest specimen of rough Whitby Jet in the world and it was this responsibility that led to the decision to open the Museum of Whitby Jet located in the heart of Whitby’s old town. With a firm belief that the history and heritage of Yorkshire’s gemstone should be shared with the world, this dedicated museum is just the next chapter in W. Hamond’s legacy.


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T H March are best known as the foremost brokers for the jewellery trade, offering a wide range of products and are experienced in meeting the insurance needs of retailers, designers, manufacturers, makers, collectors, repairers and wearers, who are all part of the UK’s diverse and vibrant jewellery scene.

T H March also offers a wide range of commercial and personal insurance products to suit the needs and requirements of all kinds of people and organisations. Insurance cover for your business, home, your life, health or any other precious possession.


Established in 1974 by Antonio "Tony" Bonanno (as alumnae of the Gemmological Association of Great Britain), AGA was envisioned as a network for sharing gemological information and skills. Graduate gemologists of the Gemological Institute of America joined in 1975. The international Accredited Gemologists Association of today proudly counts among our members some of the worlds leading independent gemologists.

The AGA is an independent, international, nonprofit organization dedicated to...

Gemological Education & Research
Identification & Evaluation of Gem Materials
Development of Professional Standards of Analysis, Practice & Ethics

We are an organization of all beliefs and cultures and share a common bond of the love of gemstones. AGA believes in excellence and is dedicated to establishing the highest professional standards of practice.

Founded in 1977, and located in the heart of New York's gem and jewelry district, American Gemological Laboratories (AGL) is an international gemstone testing facility specializing in comprehensive colored gemstone analysis. AGL provides detailed identification and enhancement reports, country-of-origin reports, as well as complete colored stone analysis documents tailored to gems of unique importance.


The Canadian Gemmological Association is a not-for-profit corporation that was established in 1958 to provide a Canadian source for gemmological education and to act as a medium for communication and co-operation among those involved in all aspects of gemmology.

Their mandate includes the dissemination of knowledge and information, and the promotion of high ethical and professional standards within the sector.

BKT Rings Ltd is a family firm producing an extensive range of jewellery suitable for the independent retailer - traditional and modern designs in 9ct and 18ct, set with diamonds and coloured gemstones.

TJW Diamonds Ltd is a family firm specialising in antique and second-hand jewellery. We sell rings, brooches, pendants, earrings, alberts, bracelets, pocket-watches, cufflinks, necklaces, fobs, etc. We are always looking to buy second-hand jewellery and welcome enquires, whether for buying or selling.




Operating since 1826, Lyon & Turnbull are one of the longest established fine art and antiques auction houses in the United Kingdom. In the 21st century, they combine dedicated personal advice and attention with innovative, thoughtful marketing and a deep understanding of the world of art and antiques to offer an unparalleled auctioneer service.

Lyon and Turnbull hold approximately 30 auctions per annum, including specialist categories such as Scottish paintings, British & European paintings, Asian works of art, jewellery, silver, antiques, books, furniture and contemporary art and design.

In addition to the specialist auctions, their raison d'etre are single-owner collection sales. Each one carefully crafted to accentuate the quality and uniqueness of the particular collection, generating un-missable events for collectors, and high (often record) prices for their clients.

Lyon & Turnbull operates internationally, providing valuation and auction services worldwide, and ensuring their client's works of art and antiques are seen, desired, and purchased by the world’s largest art markets in Europe, America and Asia. 


Almod Diamonds Ltd., a family owned US-based diamond retailer debuted Crown of Light in 2006 in response to consumer demand for a unique premium diamond unlike anything offered on the market. The Crown of Light is a 90-facet patented modified round brilliant diamond boasting a distinctly recognizable profile.  It’s higher crown and smaller table facet produces a domed top comprising 3 times the number of bezel facets over conventional round diamonds. The strategically designed facet shapes, their size and angles cut to exacting standards and their relationship to each other results in greater light performance. 

The Crown of Light patented and branded diamond delivers greater sparkle and fire than any other cut on the market today with testing results confirming this critical trait. Almod Diamonds, now entering its 4th decade is vertically integrated via mining, manufacturing and retailing diamonds through strategic outlets. Crown of Light is sold exclusively online and at targeted retail locations.