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Author Topic: Star Sapphire?  (Read 1554 times)

JBK

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Star Sapphire?
« on: January 12, 2024, 01:20:16 PM »
Hi All, if I was to cab this sapphire along the c-axis to see if I can get the star showing, would you start with the smaller or larger plane? Thanks Joe








« Last Edit: January 12, 2024, 01:22:05 PM by JBK »

MakkyBrown

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Re: Star Sapphire?
« Reply #1 on: January 12, 2024, 05:02:02 PM »
I wish you best of luck, I have a good track record of not finding stars  ???

JBK

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Re: Star Sapphire?
« Reply #2 on: January 12, 2024, 06:58:54 PM »
Thanks MB, I know what to expect then😊

swirly

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Re: Star Sapphire?
« Reply #3 on: January 13, 2024, 03:33:38 PM »
some one once told me to put a drop of baby oil on the c axis then a bright flash iite should show a small star if there is one there.good luck

JBK

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Re: Star Sapphire?
« Reply #4 on: January 13, 2024, 07:44:34 PM »
Thanks swirly, will try

Faceting Frank

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Re: Star Sapphire?
« Reply #5 on: January 14, 2024, 01:50:23 PM »
Don't want to look stupid, but what is the C axis?

JBK

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Re: Star Sapphire?
« Reply #6 on: January 14, 2024, 01:58:30 PM »
I only just read about it last week.

JBK

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Re: Star Sapphire?
« Reply #7 on: January 14, 2024, 02:16:20 PM »
Touched it with #600 grit but can’t see anything promising






« Last Edit: January 14, 2024, 02:18:28 PM by JBK »

RHS

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Re: Star Sapphire?
« Reply #8 on: January 14, 2024, 04:36:05 PM »
You won't see a star on a flat. Put a drop of high viscous honey or similar on the stone. Have it domed. You may then see a star. All the best!

JBK

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Re: Star Sapphire?
« Reply #9 on: January 14, 2024, 05:06:26 PM »
Ok thanks for the advice, I will try that

Manficat

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Re: Star Sapphire?
« Reply #10 on: January 16, 2024, 11:32:10 PM »
I've never really seen these stones before. So are they a bit of corundum with a star on them? If so, how do you know that there is a star if you can't see it? Although you haven't found the star yet, the rock still looks very interesting! Did you find it in a creekbed?

JBK

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Re: Star Sapphire?
« Reply #11 on: January 17, 2024, 12:36:53 PM »
Yes Mandicat, found GG creek gravel. Have few specimens ( not faceting material) that I’m not too sure what to do with it , hence looking to see if there is any signs of star.

Manficat

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Re: Star Sapphire?
« Reply #12 on: January 17, 2024, 06:17:28 PM »
Interesting! Good luck

Bucket

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Re: Star Sapphire?
« Reply #13 on: January 18, 2024, 11:32:01 AM »
I've never really seen these stones before. So are they a bit of corundum with a star on them? If so, how do you know that there is a star if you can't see it? Although you haven't found the star yet, the rock still looks very interesting! Did you find it in a creekbed?
The star is a resultof light reflecting back off rutile inclusions in the stone. It usually only is visible from one direction and I'm not sure on what axis it's visible as like you, I haven't had a lot to do with star sapphires. I do know that the black or dark blue with the gold star looks brilliant and that the star colour can vary from silvery white to gold. I also know that if you cut it on the wrong axis, the star won't show up, it will just look like a silvery/gold sheen.
« Last Edit: January 18, 2024, 11:37:23 AM by Bucket »
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