About the Sinkankas Symposium

The Sinkankas Symposium has been described as the most important gemological conferences in North America by respected authorities on gemstones. The annual event is named for John Sinkankas (1915–2002), one of the most distinguished and influential figures in gemology and mineralogy. Every year, presentations on a featured gem theme are given by specialists in diverse gem-related disciplines. 

Organized by Roger Merk for 13 years (2003–2015), the Sinkankas Symposium is co-sponsored by the Gemological Society of San Diego (GSSD) and the Gemological Institute of America (GIA), with generous support from Bill Larson from the event’s inception. Prior to 2021, the one-day event has been hosted at the GIA worldwide headquarters and Robert Mouawad Campus in Carlsbad, California.


Seventeenth Annual Sinkankas Symposium – Agate and Chalcedony

For the first time in the history of the Sinkankas Symposium, in 2021, the hosting platform for the event is virtual and free-of-charge. Registration is still required (for more information, visit the official website at: sinkankassymposium.net . The virtual experience will feature a menu of nine pre-recorded 1/2 hour exclusive presentations available to view on-demand from Saturday, April 24, 2021 until Saturday, May 8, 2021 on the Sinkankas Eventbrite page. Printed proceedings of 17th Annual Sinkankas Symposium are available for purchase via this portal at a special rate for a limited time. Printed proceedings of past events dating to 2014 are also available. For more details about the Sinkankas Symposium, visit the official web at sinkankassymposium.net


Sinkankas Symposium printed proceedings

Specifications: 8.25" x 10.75", digital press, full color, soft cover, perfect binding. Cost: $35.00 + sales tax (where applicable) + shipping (varies based on destination) Limited offer: Orders placed between Friday, April 16th and June 1st, 2021 will ship by June 16, 2021. Print run for 2021 is limited to orders placed by June 1st, 2021.