Welcome to the Contra Costa Mineral and Gem Society!

Our general meetings are the 2nd Monday each month at Centre Concord, 5298 Clayton Rd., Concord, CA 94521. Meeting hall opens at 6:30 p.m., meeting begins promptly at 7:30 p.m.

Next meeting Monday, May 13, 2019:


For Westerners, jadeite seems difficult to understand because Chinese have a traditionally different approach of jadeite. Roland will clarify these differences between East and West and how to overcome them to better assess quality grade and value of jadeite.

He will also present the updated knowledge about Burmese jadeite, including its geology, its main properties that make jadeite so unique among all gemstones, its most common varieties and sub-varieties, the importance of texture and color, and the basics in jadeite grading and appraising of jadeite.

Roland will also explain terms such as “imperial jade”, “flower jade”, “Fei Tsui” and many more, and their interpretation in the trade. Finally, he will also describe the various treatments and how they affect jade materials and their value.

More news:

Stained glass taught by Betty Pankey
Have you ever wanted to try your hand at a new craft before you invested in the necessary equipment? Now is the time!
The class will be held Saturdays, May 18th & May 25th from 1:00 PM to 4:00 PM at the Hobby Lobby located at 5849 Lone Tree Way, in Antioch. Limit is 4 – 5 students.  (Everyone is welcome but priority will given to people who have not taken this class before. If there is still space, previous students may sign up. A wait list will be kept.)
Betty will be providing required supplies. Cost per member: $10.00. (After the class has been completed, the club will reimburse each member in attendance $10.00)
A signup sheet will be available at the May general meeting.


CCMGS is now on Facebook!



Monthly Display Competition

Members are eligible to enter these competitions and win recognition.  As long as there are two or more items entered in the area of competition, the winner is eligible to win a cash prize!
FACETERS: Create a new project and bring it in to share. We have a special display tray to show your work off at its beautiful best!
WEARABLE ART: Bring your original work, necklaces, earrings, rings, cuffs, etc. and hang them on our special display board for everyone to see, enjoy, and vote for!
CABBERS: We have three categories for you to compete in:
NOVICE: Any member who has not won the “Pro” designation in previous years.
PRO: Any member who has won the “Pro” designation in previous years.
SHAPE OF THE MONTH: Pros and Novices compete side-by-side to create the most eye-catching cabochon in the shape of the month.

The shapes are:
January: Irregular
February: Heart
March: Round
April: Oval
May: Pear (teardrop)
June: Rectangles & squares
July: Free-form
August: Triangle
September: Auction night – no competition
October: Marquis
November: Oval
December: Holiday party – no competition