The Sinkankas Symposium – Tanzanite & Tsavorite

Named for one of the most distinguished and influential figures in gemology and mineralogy, the Sinkankas Symposium is an annual one-day event featuring presentations by noted specialists working in diverse gem-related disciplines.  The Fifteenth Annual Sinkankas Symposium commemorates the 50th anniversary of the discovery of Tanzanite and Tsavorite, two of the most beautiful, storied gemstones from East Africa.

The Sinkankas Symposium has been described as the most important gemological conference in North America by respected authorities on gemstones.  Founded and organized by Roger Merk for 13 years (2003–2015), the annual event for 2018 is co-sponsored by the Gemological Society of San Diego and GIA (Gemological Institute of America), which has provided the Symposium venue every year.  Bill Larson has been a generous supporter and speaker at the event since its inception. 



Tanzanite crystal cluster covered in prehnite and calcite. Courtesy of Pala International. Photo: Mia. Dixon.

Registration is now open at:   (Online only)


Saturday, April 14, 2018

GIA (Gemological Institute of America)
World Headquarters and The Robert Mouawad Campus
5345 Armada Drive
Carlsbad, CA 92008


Interest in the Sinkankas Symposium and attendance has grown every year.  Space is limited and is available on a first-come, first-served basis.  Registration is now open through April 9, 2018, or until tickets are sold out.  Registration for the one-day event includes refreshments, lunch and a copy of the 2018 Sinkankas Symposium volume, which features selected papers on Tanzanite & Tsavorite.

Registration:   Online only.

Cost: $105.00 per person through March 15, $125.00 after March 15 (or until sold out).

Each registrant must appear on the GIA parking list under his/her own name (no group registration under one name). Bring valid government ID with picture. You must be on the parking reservation list to access the event (therefore, there is n o on-site, same day registration.)



Recognized specialists in fields ranging from geology and mineralogy to history, treatment, cutting, collecting and selling will make presentations on Tanzanite & Tsavorite.

Dr. Raquel Alonso-Perez
Meg Berry
Bruce Bridges/Judith Bridges
Robert Gessner
Bill Larson/Will Larson
Shane McClure
Nathan Renfro
Stuart Robertson
Dr. George Rossman

* Speakers subject to change


© 2009– 2017 Lisbet Thoresen. All Rights Reserved.   Editor and Designer: Lisbet Thoresen