New Mineral Named After GIA’s John Koivula
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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Wed Dec 08, 2010 11:47 am 
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Here's a selection of Tiffany stone cabs. One of my favorite materials, mined in Utah. It's more properly called bertrandite and opalized flourite, although from what I gather the exact makeup of the stone varies.


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bertrandite4.jpg
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bertrandite1.jpg
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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Wed Dec 08, 2010 3:28 pm 
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much of the jewelry i wear is jasper cabs set in silver.
i'd love to see that tiffany utah material set!

MoZo


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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Wed Dec 08, 2010 4:50 pm 
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As mentioned, there's considerable debate about whether this lovely opalized material from a Utah beryllium mine actually contains Bertrandite. It comes in many manifestations and a number of colors/color mixtures. I have some pieces waiting to be cut that combine various shades of brown and white. In addition to being called Bertrandite and Tiffany Stone it's also known as Ice Cream Stone and Virgin Purple (it's mined near the Virgin River in Utah).

Here are a couple of cabochons that show some of the color variations (there are many more).
Attachment:
DCab 147a.jpg
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And darker purples:
Attachment:
DCab6.JPG
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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Wed Dec 08, 2010 6:00 pm 
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And here's a red Tiffany stone:


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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Wed Dec 08, 2010 7:09 pm 
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Nice one! I've seen some reddish-browns but not red.

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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Thu Dec 09, 2010 10:35 am 
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ooh, that dark purple cab is GORGEOUS. drools

Here's a hunk of Tiffany stone from one of my favorite ebay sellers of beautiful jasper, agates, and other pretty rocks:

Chiming Rock


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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Thu Dec 09, 2010 12:03 pm 
well mee i have the very pretty indian tiger's eye ring and the cabochon is about average 2 large what really makes it so unique thwe red it has blended into the stone and the goldsmith said 2 me its sterlinmg silver and the tigers eye is genuine i hope 2 collect more sterling silver cabochon rings i used to have white moonstone caboch ring unsure what happened to it it was very pretty when i had it:) and yea love the tigers eye i've seen a stone called "tiger iron" thats exactly like it i may be "tiger iron" i believe it may be a form of tigers eye i am not too sure tho...but... heres my cabochon tigers eye silver ring Image btw it is stamped 925 inside the the side of the shank signifying its sterling silver:)


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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Thu Dec 09, 2010 12:20 pm 
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This is tiger-iron. I have better ones but this is the only image in my file this morning. It's a scenic blend of tiger's-eye, black hematite and red jasper. The source is Australia.


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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Thu Dec 09, 2010 12:50 pm 
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oh, my goodness, i so love that AU stone!

amethyst is motivating me to take pictures of my jasper and/or cab rings. if/when i do i'll post here. i have many.........morgan hill poppy, australian forest, madagascar ocean jaspers as well as some other interesting cabs.

more later if the camera works and my photo skill don't suck to badly.

mz


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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Thu Dec 09, 2010 1:06 pm 
haha 1 of the weirdest things in i found it 2nd hand 2 bucks i didnt notice the red in it at 1st but my god when i noticed it i thought thats like soo weird 4 tigers eye 2 go the colour i'm wondering if its natural or what or if its a major colour fault but i love this ring i wear it ALOT like all the the time:) and yea the silverwork is amzingly done by hand i can't help but talk about my ring its incredibly beatiful:)


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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Thu Dec 09, 2010 3:52 pm 
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Cool cabs with cool patterns. I forgot how fun it is to make cabs. Now I feel like taking my cab grinder out of the cupboard again.

I'll contribute with some blue Chalcedony cabs from Namibia. Believe it or not, all three cabs are cut from the same piece of rough. The large round is 36 mm (1.5 inch) in diameter and about 174 carats. The drop shaped is 11.5 and the oval 10 cts. All natural, translucent material.

Image

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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Thu Dec 09, 2010 6:55 pm 
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Dreamy Conny 8)

Lot of action in there Rom, tiger Iron can be quite striking. :P

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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Thu Dec 09, 2010 7:55 pm 
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AmethystLoverNikki wrote:
haha 1 of the weirdest things in i found it 2nd hand 2 bucks i didnt notice the red in it at 1st but my god when i noticed it i thought thats like soo weird 4 tigers eye 2 go the colour i'm wondering if its natural or what or if its a major colour fault but i love this ring i wear it ALOT like all the the time:) and yea the silverwork is amzingly done by hand i can't help but talk about my ring its incredibly beatiful:)


I like tiger eye :) Typically red tones are brought out in tiger eye by heating; it's not a fault at all, although an indicator that your stone might have been baked at some point ;) You can also find dark blue tiger eye.

Connie, your blue chalcedony is STUNNING!

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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Thu Dec 09, 2010 8:52 pm 
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Conny: :shock:

W O W ! Nice Chalcedony!


If anyone wants a peek at my cabs, look at the "Off The Dop" Thread... unless ya want me to post them here? I should have a bunch more coming up soon, including some Aussie opal and some gemmy Chrysocolla, a green tourmaline and maybe an "apricot"-colored tourmaline that's just about flawless... unless someone convinces me to not cab it. :)

Great thread, let's give those cabs the attention they deserve!

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 Post subject: Re: Select Stones, Cabochon Special Edition
PostPosted: Thu Dec 09, 2010 11:01 pm 
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Most of these are just quick snapshots sitting on my cutting table on a piece of plexiglass, lol, sorry. Some cabs don't even have backs done yet so may be some wax and/or glue back there too.

Highly agatized stromatolite
Image

Graveyard Point Plume Agate w/ crystal vug
Image

Tube agate or plume, need to figure out which, looks like tube, but I am sure it was plume and that I just trimmed a differing direction
Image

A chrysocolla, cuprite, azurite, malachite, turquoise, and who knows what else copper conglomerate type material from Nv or Az
Image

a peach precious opal from Mexico, odd ball
Image

Blue Opal from a one hit vein in Virgin Valley, not sure if any more has been found or not yet. I am under the belief that it is the same mineral/opal belt that extends all the way into the blue opal areas in Oregon as well.
Image

Chocolate type precious opal from Magdalena Mexico, very very old stock material, at least 35yrs+ old
Image

Orange high dome fire opal with POC from Magdalena, again, 35yr+ old stock:
Image

No clue, chrysocolla, quartz, pyrite or marcasite, azurite, all kinds of things, anyone know a name? This is just pre-polish, due to all the differing material hardnesses, I had trouble with a final polish, but am going to use ZAM + soft leather pad, it should work flawlessly. Again, from Az, Nv, or Or.
Image

Another VV blue opal, sorry about the fingerprint on it, lol.
Image

Just going to polish the face and leave as is. This is a slice of a piece of petrified wood. See the Mimetolith in it?
Image

Psilomelane from Mexico, talk about a messy PITA to work with!!!
Image
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A really gemmy VV blue opal, a bit blurry, sorry:
Image

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