Dec.20 to 22:SAN DIEGO, CALIFORNIA: Wholesale and retail show; Gem Faire Inc.; Scottish Rite Center; Fri. 12-6, Sat. 10-6, Sun. 10-5;
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Wed Dec 11, 2019 2:02 am

All times are UTC - 4 hours




Post new topic Reply to topic  [ 8 posts ] 
Author Message
 Post subject: Polishing quartz
PostPosted: Tue Apr 02, 2019 6:29 am 
Offline
Active Member

Joined: Mon Aug 28, 2017 10:39 am
Posts: 53
Location: Birmingham - England
I've been buying a few samples from various suppliers and one has sent me
some nice smokey quartz. Unfortunately when looking at it at high resolution
I noticed patches of very tiny pits. This means I'm not prepared to sell them
on as they stand but I wondered if I could have a go at polishing them out myself.

The only tools I have that may help are a small oil stone and a dremel 300 workstation.
I'm not planning on doing this regularly but I thought it would be good to at least
have a go. And the stones themselves aren't high value so no problem if I mess it up.

Can anyone advise me on what to use - The pitting is just surface by the looks of it
all from the quartz supplier. I've read about various powders/diamond sprays etc
as well as using leather for buffing up but I'm not sure of grades or methods of use.

I get supplies from cooksons so obtaining stuff shouldn't be an issue.
I dont mind spending a bit on tools if people think I might come across this
regularly?

Any advice welcome.
john


Top
 Profile  
Reply with quote  
 Post subject: Re: Polishing quartz
PostPosted: Tue Apr 02, 2019 6:22 pm 
Offline
Gemology Online Veteran

Joined: Mon May 26, 2014 9:42 pm
Posts: 809
Are these crystals you are trying to polish? If so, as a buyer, I won't buy any that have been "touched up". The whole point of getting a crystal (for me) is to have it be natural. Your buyers may differ, though - certainly there are a lot of "fake crystals" where all the polished sides are clearly not natural at shows.
If you are selling them for facet rough, it shouldn't matter to the buyer.


Top
 Profile  
Reply with quote  
 Post subject: Re: Polishing quartz
PostPosted: Wed Apr 03, 2019 4:26 am 
Offline
Active Member

Joined: Mon Aug 28, 2017 10:39 am
Posts: 53
Location: Birmingham - England
Hi Stephen - thanks for the reply

It's one of the pitfalls of buying online I guess - at first glance
things look fine - then hidden issues crop up... I'm learning.

These are just polished cabochons that have surface damage.
Cutting from rough would be beyond me at present.

I've done a bit of reading online but I thought it may be a good
idea to get some input here before I start out wrong.
I don't want to be buying stuff used to polish diamond if polishing
quartz uses different materials for instance. You never know if
what you read online is right.

An off the cuff comment here is probably worth a dozen "blog" pages.

john


Top
 Profile  
Reply with quote  
 Post subject: Re: Polishing quartz
PostPosted: Wed Apr 03, 2019 11:38 am 
Offline
Gold Member
User avatar

Joined: Thu Jan 24, 2008 4:01 pm
Posts: 1871
Location: Pine City, NY and Dothan, AL
With a Dremel tool, it's going to be hard to grind imperfections out of a cab without leaving an uneven surface. You need wide wheels, like those used to cut the cab originally. You could try using 3K diamond to get past the pitting (but don't be surprised if it just leaves you with more pitting), then polish with 50K diamond or cerium oxide.

I didn't respond earlier because, like dchallener, I thought you were trying to modify specimens. That's a no-no.


Top
 Profile  
Reply with quote  
 Post subject: Re: Polishing quartz
PostPosted: Wed Apr 03, 2019 2:10 pm 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 3450
Location: North Carolina
Yeah, you're going to hate doing it with a dremel. It could be done pretty quickly on a cabbing machine though. Typically cheaply made cabs are preformed (maybe on a machine) and then tumbled, so there isn't much care or qc in the process. Sometimes they turn out well, sometimes less so. Very cheap to do, and if you can hand select from a parcel you can get great deals. If you buy a larger parcel there is some inevitable waste.

_________________
https://www.etsy.com/shop/angryturtle


Top
 Profile  
Reply with quote  
 Post subject: Re: Polishing quartz
PostPosted: Wed Apr 03, 2019 6:53 pm 
Offline
Active Member

Joined: Mon Aug 28, 2017 10:39 am
Posts: 53
Location: Birmingham - England
Thanks to both for the replies.

So something to put on the back burner then.
It's only the stock I've been buying to learn with so no big issue.
I may look into the cabbing machine and make a note of the polishing materials
for future reference though. (Maybe I'll get more time one day)
Thanks anyway.

Damn it... now I've seen the cabKing ... does anyone know how to get
96 hour days?

john


Top
 Profile  
Reply with quote  
 Post subject: Re: Polishing quartz
PostPosted: Sun Apr 21, 2019 1:48 pm 
Offline
Established Member

Joined: Wed Jan 18, 2017 1:08 pm
Posts: 30
Location: Bergisches Land
johngemo wrote:
Thanks to both for the replies.

.. does anyone know how to get
96 hour days?

john

Well, its all a question of the right breathing-technique.Just have to find a Yogi to teach You 8)

best of luck
gemse


Top
 Profile  
Reply with quote  
 Post subject: Re: Polishing quartz
PostPosted: Sun Apr 21, 2019 2:35 pm 
Offline
Valued Contributor
User avatar

Joined: Sun Jul 22, 2007 5:58 pm
Posts: 295
Location: California desert
Damn it... now I've seen the cabKing ... does anyone know how to get
96 hour days?

The most man has been able to do seems a max of 40 hrs. If you are undergound in a cave with no info coming in that will tell your brain the time and day. This guy stayed under for 6 months and reached 40 hrs some times, but totally the average increased.
https://nypost.com/2017/01/22/this-expl ... in-a-cave/

I brought up this experiment a couple of weeks ago when I was lecturing to my class on the brain and sleep.
Jim


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Gemology Style ported to phpBB3 by Christian Bullock