I am just starting out, but am trying to find out what grits I need and which stones I can mix. I have some uncut Amethyst, Uncut Emerals, Uncut Citrine, and about 2 lbs of Ruby Sapphire. I have been looking at grits as well as trying to find selelrs of grits. Can I mix any of these in the Rough Stage? Do I need Diamond Powder or ?Borine? Do I need to get some pellets still? I have a dual Tumbler.
Ruby and sapphire are both corundum, which is 9 on the Mohs scale of hardness... and that is hard! Few people tumble corundum. I'd suggest you start with quartz first, you'll see better results in much less time. Plenty of suggestions on grit to use and steps to follow can be found on this website if you just look around.
As someone who has tumbled more gemstone than agate to date, I'd also say start with something a little easier than especially the ruby/sapphire, <grin>. Wouldn't want you to get discouraged before you're well and truly hooked...
Of what I've done so far, the best results I've gotten have been citrine and topaz, and I've seen some great results others have had with garnet as well. The emeralds I've done have also come out pretty well, but being opaque and buried in matrix like they are they're not quite as good a result as the topaz and citrine have been. The amethyst I've gotten to date has been full of fractures and I haven't gotten much to brag about from those - maybe ten fairly nice stones out of 80-odd.
My ruby/sapphire tumbling results are just a few threads down on this page - and they've been tumbling off and on for nine months or so. The kind of ruby and sapphire that you get in these 'mine-run' mixes are not facet grade, they are completely opaque and at best are the variety that may star if cabbed rather than turn up clear like a stone you'd facet. Tumbled rather than cabbed, what I'm seeing with mine is that at some angles (especially when wet) you get a bit of 'depth' to the stone, and a bit of shimmer from [what I assume are] the layers of alumina - sort of like what you get from Labradorite or Moonstone, but not as flashy or colorful as Labradorite. I'll do my best one of these days to capture on camera what my eye can see.
The only stones you'd need anything diamond for would be the corundum (ruby/sapphire), and then only for the later stages - the emeralds, citrine and amethyst can be done just fine with regular grits and polishes, and the regular SC coarse and medium grits do a pretty good job for the early stages on the corundum as well. I've got a split experiment running right now, with some of the corundum in a tumbler with diamond paste (powder would have been fine too, just that you usually get more diamond per ml/gm in the paste than in a powder), and some in just regular polish or pre-polish. I am seeing some shine on the flatter areas with the ones that are in regular polish after a month of being in there (compared to a day or two for most other stones in a Lot-O at the polish stage), but it's nothing spectacular and I expect that I'd have to leave them in that polish for another six to nine months before they looked anything like polished stones on every side.
The ones in the diamond run are faring a bit better, have shown quite a bit of improvement in the week or so they've been running. I'll take some more pics in a couple of days. They're in a very small (1.1lb) vibe tumbler, btw - I wouldn't myself have wanted to try this with diamond in a 3lb rotary or 4+lb vibe, because it would get *very* expensive. I don't have any idea what diamond's breakdown rate is as compared to SC (for grit-renewal purposes), but even the initial amount needed would be fairly pricey. I want to say that I paid around $60 incl tax/ship for three 5-ml syringes (one 4k, one 14k, and one 50k mesh), and I'd think it would take most of one syringe to charge a 3lb or up tumbler just one time.
I probably wouldn't have taken on the corundum (or would have given up on it long before now) if I hadn't had other tumblers working on things that give better and faster results. Or if I hadn't had a Chicago Electric whose days I already knew were numbered without upgrading the motor, fan and pulley (I did change out the belt, pretty much a must with any CE as the ones they come with don't last) to put them in. It lasted long enough to get the corundum through coarse and medium, and having them there didn't hinder my progress on anything else, so it wasn't a particular hardship or trying-of-patience to have those taking up a barrel on that particular tumbler for that long. But if you're planning on doing them in one dual rotary, I'd definitely recommend starting with something that will show results a lot faster than corundum will.
great info, thank you. I also have the problem of obtaining highly polished rubies-sapphires; since the time you posted your thread, have you achieve better-faster results using different methods-abrasives?
Fossilman: Got a hounding buddy in Vegas,just PM'ed him to see what he comes up with.....
Feb 8, 2016 11:08:53 GMT -5
meviva: Thanks Fossilman
Feb 8, 2016 11:17:02 GMT -5
Rockhobbit: Will be in the 80's here for the next 3 weeks! Rock weather!! Yipppeeee!!!!!!!!
Feb 8, 2016 11:47:30 GMT -5
Fossilman: 60's here today and four days after....A bit at a time I say...LOL I am ready though...
Feb 8, 2016 11:49:47 GMT -5
jakesrocks: Woo Hoo, finally got up to 34 here.
Feb 8, 2016 15:46:47 GMT -5
rockpickerforever: OMG, it is a blistering 84 degrees here now. Expecting 90ish tomorrow or the next day. Just kidding about the blistering, I really love it. No rain in sight for at least ten days. Wall to wall sunshine, just how I like it!
Feb 8, 2016 17:52:23 GMT -5
Fossilman: Time for Jean to hit it hard now!!!!!!!!!!!
Feb 8, 2016 18:19:07 GMT -5
edmohs: the 80's is to hot to rock ha ha but the morning are just fine for long time!
Feb 8, 2016 19:16:37 GMT -5
edmohs: but not bad under an umbrella
Feb 8, 2016 19:17:17 GMT -5
Fossilman: Weather is beautiful outside-time to put the trim saw together,that I bought from Don...
Feb 9, 2016 12:28:07 GMT -5
quartz: Carol and I went to the coast yesterday, weather beautiful, 72, but Moolack and Ona beaches, either side of Newport, OR all sanded in. NO ROCKS. sad.
Feb 9, 2016 13:42:37 GMT -5
Fossilman: Moolack and Beverly,plus Forgery,I walk along the walls near the cliffs...Always a fossil or two popping out and laying on the ground-waiting for this old man to take it home...I heard Seal Rock isn't to bad...Lincoln City is the hot spot so far..
Feb 9, 2016 15:45:06 GMT -5
jakesrocks: Dang Mike, bout time ya got that saw running.
Feb 9, 2016 17:48:27 GMT -5
Fossilman: Ya' Don,my shop is the big toolbox in the sky...........The weather,lets me know when I can play with my toys....My little shop,that I do have,is storing my toys.....
Feb 9, 2016 18:40:53 GMT -5
edmohs: not sure what to shout about but I'll shout it anyways...mohs
Feb 9, 2016 21:39:09 GMT -5
jakesrocks: Can you hear me now
Feb 10, 2016 10:50:57 GMT -5
Fossilman: You woke up alive Ed,that's worth a SHOUT!!!
Feb 10, 2016 10:54:26 GMT -5