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Lapidary / Gemstone Community Forum
April 25, 2019, 02:08:11 pm
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Cabochon Girdle Size

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Author Topic: Cabochon Girdle Size  (Read 303 times)
mrlnavy
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« on: November 18, 2015, 08:03:44 pm »

I will be getting my Cabbing machine soon and was looking at some U-tube videos. If you leave a girdle on a cabochon what size should it be? Is there a standard size in-case someone wants to wire wrap it?

Thanks for the help.
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Mike Longoria Sr

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« Reply #1 on: November 19, 2015, 07:21:17 am »

To set a cab into a bezel setting it helps to have the girdle edge around 15 - 20 degrees. For wire wrapping I imagine you could make the edges more rounded ... but I'm not sure have not done any wire wrapping.

 Have fun with your new cab machine, looking forward to seeing what you make!

 John
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Hummingbirdstones
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« Reply #2 on: November 19, 2015, 07:27:02 am »

As far as I know, there's no set size.  Thicker stones will have thicker girdles and vice versa.  I like slightly thicker stones, myself, but keep in mind that the wider the girdle, the more metal you will need to use.  For wire wrapping, the width of the girdle will determine the gauge of wire you will use and also the number of wires you will need to wrap the piece.  Most wire wrappers prefer a straight up and down girdle on their cabs, as it helps prevent wire slippage. 
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Robin

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« Reply #3 on: November 19, 2015, 07:30:30 am »

Start at about half the total height and see how you like it.  I generally go a bit less, but no set dimension.  What is more important is that it is the same all the way around.  This can take a lot of trial and error on cabs with points.
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light house jack
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« Reply #4 on: November 19, 2015, 08:18:03 am »

In my cabochon class at William Holland, I teach to mark the cab approximately 1/3 up from the bottom. Different teachers may not teach the same. I have a friend who marks her cabs much lower to save on silver.
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redrockrods
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« Reply #5 on: November 19, 2015, 10:09:16 am »

Bezel strip comes in 3/32", 1/8", 3/16" and 1/4" widths, so for convenience factor, the stone girdle should match one of these sizes.

For wire wrapping: very thin cabs with no girdle are not desirable since it is very difficult to frame the stone with wire. straight sides with a girdle of 3/32" or so is probably preferable as that will accommodate about 4 strands of 22ga square wire which is the standard number of wires used in a basic wire wrap pendant setting. the wider the girdle, the more strands that need to be used to frame the stone. Also, many wire wrappers look for stones with polished backs as well since the back will be visible. So if you're going to market to wire wrappers, polish backs.
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mrlnavy
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« Reply #6 on: November 21, 2015, 10:04:25 pm »

Wow thank you all for your help and information on this. I really appreciate it.
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Mike Longoria Sr


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