Novembr 16-18—COLUMBIA, SOUTH CAROLINA: Annual show; The Columbia, SC Gem and Mineral Society; Fri. 10-6, Sat. 10-6, Sun. 12-5
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 Post subject: Found Cabachons
PostPosted: Sat Oct 13, 2018 11:13 pm 
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I just found these cabachons in my grandfathers dressing case! Can anyone tell me what they are? TIA!
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 Post subject: Re: Found Cabachons
PostPosted: Sat Oct 13, 2018 11:16 pm 
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The round one is concave on one side.
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 Post subject: Re: Found Cabachons
PostPosted: Sun Oct 14, 2018 12:09 am 
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Location: San Francisco
2,6,1 are agates.


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 Post subject: Re: Found Cabachons
PostPosted: Sun Oct 14, 2018 9:00 am 
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All look like Chalcedony varieties to me. Which means they are all microcrystalline quartz. To differentiate by type we need to look at banding, translucency, and color.

Judging from the pictures,

I would classify 5, and 6 as agate based on the translucency, and wavy/curved banding.
I would call 1,4,3 Jasper based on pattern and low translucency.
I would call 2 Sardonyx based on the brown color with straight banding.

Making the call on variety in Chalcedony is often where I would disagree with GIA during the GG course. But oh well, the difference has no monetary consequences.


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 Post subject: Re: Found Cabachons
PostPosted: Sun Oct 14, 2018 12:15 pm 
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Thanks for the help! It's a mystery as to where they came from. He died in 1937. #2 (sardonyx) is my favorite!


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 Post subject: Re: Found Cabachons
PostPosted: Tue Oct 30, 2018 11:31 am 
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I would concur, all seem to be varieties of SiO2. No 2 is interesting, cabochons cut from dark stones used to be cut that way to lighten them, but I haven't seen an example in many years.


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