Post subject: Re: Before and After – Post YOUR Transformation Pics
Posted: Wed Jun 26, 2019 8:21 am
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Joined: Wed Feb 25, 2009 5:53 pm Posts: 175 Location: Toronto
Attachment:
20190626_075800.jpg [ 2.45 MiB | Viewed 5877 times ]
I already posted a couple of these, but this is most of my cutting from the last while (in the case for a harmonica, lol).
From top left, going clockwise (EDIT: I posted the pic upside down, so from bottom right, going clockwise)
An unfortunately included and poor saturation bicolour tourmaline... where I also accidently didn't cut the c-axis oriented facets deep enough to avoid colour mixing,
Lithium Tantalate barion cushion,
Pink tourmaline, pavillion only recut,
Green zircon,
Garnet (with a 1.72 RI) with a Superman's decal-ish outline,
Post subject: Re: Before and After – Post YOUR Transformation Pics
Posted: Mon Mar 30, 2020 12:02 pm
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Joined: Fri Jun 25, 2010 12:04 am Posts: 257 Location: Idaho
I had a number of gems (mostly Oregon sunstone) to cut for a gentleman. Might as well help keep some action going on around here!
First was a green tourmaline nodule, 6.60 cts rough, source unknown. Cut in a 9-fold modified brilliant, ~2 hours cutting time, finished at 8.45 mm, 2.40 ct (36%).
Post subject: Re: Before and After – Post YOUR Transformation Pics
Posted: Mon Mar 30, 2020 12:10 pm
Valued Contributor
Joined: Fri Jun 25, 2010 12:04 am Posts: 257 Location: Idaho
Toss in another, the second cut was a 14 ct piece of Oregon sunstone, showed some schiller (or is that "shiller"?) which the owner wanted to have show.
Finished at 4.99 ct (35.6%) (bummer - just .01 under 5!) 20.02 x 7.79 mm, a mixed freeform cut the design for which was obvious in the rough... 3 hours cutting time.
Post subject: Re: Before and After – Post YOUR Transformation Pics
Posted: Mon Mar 30, 2020 7:10 pm
Gold Member
Joined: Tue Apr 05, 2016 7:58 pm Posts: 1424 Location: San Marcos, CA
Nice job!!!
With so much extra time on my hands here I should take some inspiration from this thread and get busy with a few stones that need some desperate transformations.
Post subject: Re: Before and After – Post YOUR Transformation Pics
Posted: Mon Mar 30, 2020 11:17 pm
Established Member
Joined: Mon Aug 19, 2019 2:30 am Posts: 44
Not my work, but one of these was my piece of rough. (is that allowed to post?)
A parcel of Winza sapphires and how they ended up. I liked seeing how differently all their colors turned out. Quite a pain in the butt to facet, so I heard however.
Post subject: Re: Before and After – Post YOUR Transformation Pics
Posted: Tue Mar 31, 2020 12:33 am
Active Member
Joined: Wed Aug 09, 2017 8:33 pm Posts: 80
Duncan Miller wrote:
Two Zambian emeralds, 2.86 ct (10.09 ct rough) and 2.49 ct (10.60 ct rough), for a client. Unfortunately the camera picks up the inclusions very visibly. They are less noticeable in the hand.
Attachment:
Emerald rough, resized for web.jpg
Attachment:
Emeralds cut, resized for web.jpg
Lovely color Emerald! Can I ask, how do you avoid the dark residue from polishing (am guessing with oil as lubricant) to get sucked into all those little crevices in the emerald? Or do you have them cleaned with acid afterwards?
Post subject: Re: Before and After – Post YOUR Transformation Pics
Posted: Tue Mar 31, 2020 6:14 am
Gemology Online Veteran
Joined: Sat May 22, 2010 2:51 am Posts: 755 Location: South Africa
TheL wrote:
Lovely color Emerald! Can I ask, how do you avoid the dark residue from polishing (am guessing with oil as lubricant) to get sucked into all those little crevices in the emerald? Or do you have them cleaned with acid afterwards?
I cut emeralds on a 1200 mesh sintered diamond bronze lap using only water, pre-polish on the outer band of an early production Gearloose Waterwing dual lap (also nominally 1200 mesh but it behaves as if much finer) and polish on the inner Greenway portion, again only with water. The Gearloose Waterwing is out of production but between Gearloose and Adamasfacet there are several water-only alternatives.
Post subject: Re: Before and After – Post YOUR Transformation Pics
Posted: Tue Mar 31, 2020 10:30 am
Valued Contributor
Joined: Fri Jun 25, 2010 12:04 am Posts: 257 Location: Idaho
Nice sapphires! Would love to have that kind of rough - do have some pieces of the original Umba River stuff, from the 70's....
Another Oregon Sunstone up, started as an 8.01 ct rough with orange schiller.
Finished as 2.73 ct/6.06 mm brilliant square cushion - 34% recovery, 2 hours cutting.
For this one, I was fearful the schiller would kill brilliance, but the guy wanted schiller... Ended up the schiller gave it a shocking salmon color with quite the brightness. A little internal graining (diamond clarity term), but a nice gem!
By the way - all of these sunstones were mined at the Dust Devil Mine, 2017 or 2018 I believe.
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