Seventeenth Annual Sinkankas Symposium – Agate and Chalcedony


Seventeenth Annual Sinkankas Symposium
Agate and Chalcedony


GIA Events will contact everyone who registered for the event or purchased a proceedings volume to advise on the process of receiving a full refund.


13 March 2020 (Carlsbad, Calif.) – The Sinkankas Symposium organizers have been closely monitoring public health updates on the novel coronavirus (COVID-19) pandemic, and we regret having to cancel the Seventeenth Annual Sinkankas Symposium scheduled for Saturday, May 16, 2020.

GIA is cancelling large gatherings and tours for the time being, and the general trend is to do so following the direction of the U.S. government agencies (CDC, FDA, NIAID and others), as well as municipal and state agencies. The duration of risk to public health due to COVID-19 cannot be estimated at this time, but it may last weeks or months. Therefore, this year's event will be rescheduled for April or May 2021 (Date TBD).

We are concerned that you stay safe and healthy. Please join us in 2021.





Saturday, May 16, 2020 This event will be rescheduled for April or May 2021

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



Registration: CANCELLED



Recognized specialists in fields ranging from geology and mineralogy to history, treatment, cutting and collecting will present on Agate and Chalcedony

Tim Adams – Fabergé's Work with Agate and Chalcedony

Meg Berry – So You Want to Carve Chalcedony…

Patrick Dreher – Dreher Carvings of Agates and Chalcedony

Dr. Peter Heaney – The Complex Mineralogy of Agates

Bill Larson – Collecting Fine or Rare Cryptocrystalline Quartz

Dr. Ciğdem Lüle – Chalcedonies of Anatolia: From Neolithic to Modern Day

Nathan Renfro – The Micro-World of Agate and Chalcedony

Dr. George R. Rossman – Cause of Color in Agate and Chalcedony

Lisbet Thoresen – The Cultural History of Agate and Chalcedony from Antiquity to the Renaissance



  •  Dreher Carvings: Five Generations of Gemstone Animals from Idar-Oberstein 

    Wilhelm Lindemann, Will Larson and Ekkehard Schneider
    Dreher Carvings: Five Generations of Gemstone Animals from Idar-Oberstein

    Selected masterpieces of lapidary carving by world-renowned gem carvers Peter and Gerd Dreher.

    English. Hardcover with dust jacket, 240 pages, size: 22 x 29 cm, 200 color ills. Arnoldsche.

    US $48.50.

    Amazon USA »
    Arnoldsche Art Publishers »

  •  Agate – Banded Beauty 

    Peter Heaney, Gloria Staebler with Bill Besse, Ann Frazier, Patricia Gray, eds.
    Agate – Banded Beauty
    Mineral Monograph No. 21

    Contributions by: Peter Heaney, Si and Ann Frazier, Patricia Gray, Michael Gray, Alfredo Petrov, George Rossman, John Koivula and Tarun Adlakhaeds. Illustrations by: Robert Weldon, Jeff Scovil.

    Perfect binding, 140 pages, size: A4. Lithographie.

    US $30.00
    (Save 25% on PreOrders until 5/15/2020)

    Lithographie »

  •  Agates, 2014 edition 

    Johann Zenz

    This book is an updated, limited edition of the first of three volumes on Agate by Johann Zenz.

    English. Hardcover, 656 pages, size: 24x28 cm, 2,000 ills. Limited edition. Bode.

    Euro 89.

    Bode »

  •  Exquisite Agates, 2017 

    Dietrich Mayer
    Exquisite Agates

    This book features 900 favorite specimens from the collection of Dietrich Mayer.

    English and German. Hardcover, 424 pages, size: 24x28 cm. Limited edition. Bode.

    Euro 58.

    Bode »

  •  Agates, The Pat McMahan Collection 

    Pat McMahan
    Agates, The Pat McMahan Collection

    This beautifully illustrated book is a depiction of one of the most comprehensive collections of sagenite, plume, and banded agate in the world as a result of Pat McMahan's 26 years of intensive rock collecting. The author has included some personal commentary, which makes for a interesting and sometimes funny reading experience.

    Hardback, 496 pages, size: 12.55 x 9.2 x 1.5", 1250+ ills. McMahan Press

    US $129.99

    Self-published/author website »



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