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Rock Art => Cabochons, Intarsias, Cameos => Topic started by: bobby1 on August 01, 2016, 10:11:34 PM

Title: Is it a cab or a carving?
Post by: bobby1 on August 01, 2016, 10:11:34 PM

I think I am blurring the border between a cab and a carving but I love doing the curves to match the pattern within the stone. It is Piranha Agate and it is rather large at 5" tall.
Bob
(http://i151.photobucket.com/albums/s160/Rocksbob/Rocksbob087/Piranha%20Agate%2045_zpso2vlvvpg.jpg) (http://s151.photobucket.com/user/Rocksbob/media/Rocksbob087/Piranha%20Agate%2045_zpso2vlvvpg.jpg.html)

Title: Re: Is it a cab or a carving?
Post by: irockhound on August 01, 2016, 11:07:01 PM

Beautiful form and I don't think there is a line anymore with that cab.  I can't help but think of sharks with the 3 fins coming out.  Lovely stone.

Title: Re: Is it a cab or a carving?
Post by: gemfeller on August 02, 2016, 08:39:18 AM

I think it's a great cab.  Instead of a shark I see a graceful dolphin when the image is rotated this way:

Title: Re: Is it a cab or a carving?
Post by: hummingbirdstones on August 02, 2016, 06:19:59 PM

Wowza!  Boy oh boy the cabs showing up in the last few days are amazing.   :drool:

Title: Re: Is it a cab or a carving?
Post by: olgguy on August 02, 2016, 06:38:41 PM

Definitely a cabochon! And a very beautiful one. The only question is the smallest inside curve looks difficult even for a 4" wheel. If you run a belt off the edge of the drum you can do it on the unsupported edge.

Title: Re: Is it a cab or a carving?
Post by: bobby1 on August 03, 2016, 04:06:49 AM

The smaller curves were shaped with a flex shaft machine and silicon carbide 1" Mizzy wheels run dry. They were sanded on a 8" expando wheel by running the belt 1/4" hanging over the side of the wheel. The polishing of these curves was done with a bullet shaped small hard felt wheel and rapid polish.
Bob

Title: Re: Is it a cab or a carving?
Post by: olgguy on August 03, 2016, 06:43:07 AM

With the additional information on procedure, I have to change my classification to a BEAUTIFUL CARVING.

Title: Re: Is it a cab or a carving?
Post by: Enchantra on August 03, 2016, 10:17:12 AM

I am going to call it a highly stylized freeform cab.
I love  how the shape follows the stone pattern!   :thumbsup:

Title: Re: Is it a cab or a carving?
Post by: finegemdesigns on August 03, 2016, 11:44:54 AM

Probably most carvers would say that once you start doing internal or negative cuts it starts to be a carving. A cabochon is typically a gem that has all positive or outer cut sides and is easier to set in a standard bezel setting. These observations are just from what I've seen in the market and aren't dictionary definitions.

Title: Re: Is it a cab or a carving?
Post by: Windenzee on August 04, 2016, 12:07:11 AM

Love the curve to the stone and colours. Beautiful shine.