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 Post subject: Tips on cutting Moissanite
PostPosted: Thu Feb 02, 2017 10:30 pm 
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Hello All,

I recently got a hold of a couple pieces of Moissanite rough.

Image

These pieces are supposed to be 9 carat H4 silicon carbide, in the DEF colour range (though they don't look like it).

I was warned by the seller prior to the purchase that cutting Moissanite normally would yield brown stones but that they offered a heat treat and CVD process to return the stones to the DEF colour range. The pictures they provided of the the stones they produced (supposedly from the same quality of rough they sold me) looked great after the heat treat and CVD post processing so I'm hoping I didn't get tricked...

Anyways, I'd like to know if there are any tips or things to watch out for when cutting Moissanite. Any advice at all would be appreciated as these weren't exactly cheap and I'd like to get some good stones from them. What would you guys suggest I use to cut these stones?

Thanks,
-Faken2


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 Post subject: Re: Tips on cutting Moissanite
PostPosted: Sat Feb 11, 2017 9:53 pm 
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Some quick tips:

1) Cuts like sapphire, but slower, with no orange peel
2) Gets super hot during polishing depending on how you do it
3) Can turn super brown during polishing for some of the different polymorphs or depending on the impurities
4) The treatment really, REALLY does a good job of whitening the material


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 Post subject: Re: Tips on cutting Moissanite
PostPosted: Sun Feb 12, 2017 11:13 pm 
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Hey Ayra,

Thanks for responding to me, I was getting worried I would have to cut them blind and learn on the fly.

I did a quick test polish of one of the sides by hand and I did notice dirty brown swarf (as opposed to milky white for pretty much any other stone) coming off the cutting laps. The side i polished still ended up quite brown regardless of my attempts to keep the stone cool.

Well, I guess I'll cut them and have them sent out for treatment. If all goes well maybe there will be another trustworthy source for small quantities of rough Moissanite for everyone.

Whish me luck!


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 Post subject: Re: Tips on cutting Moissanite
PostPosted: Tue Apr 11, 2017 2:57 pm 
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Who does the heat treatment????


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 Post subject: Re: Tips on cutting Moissanite
PostPosted: Thu Apr 13, 2017 9:16 pm 
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lightbender57 wrote:
Who does the heat treatment????

Me too. I want to know. I like the material, but just waiting for the price drop.

In the meantime, going to start playing with "Monosital"*

* copied from their page - Monosital™ belongs to material group which is called glass-ceramics. I.e. it’s the composite material that contains very small ( nano-sized) crystals into glass matrix. Glass-ceramics is the combination of glass and mono crystals.
The glass matrix has Y-Al-Si-O and crystal phase may be different. It depends on required color: garnet, mullite, cordierite (dichroite) , etc. The last composition definitely allows achieving the best optical index.
Even though there is no any combinations Pb (lead) and that’s why we can make high dispersion 0,015-0,02 and refraction index ( to 1,75). It’s achieved because of Y and Al as in case with crystals YAG.
We’re improving these indexes but the color is unchangeable. For example, we produced blue and orange sapphire with density of 3,6gr/cm3 and RI – 1,75, i.e. it’s like natural sapphire.

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 Post subject: Re: Tips on cutting Moissanite
PostPosted: Sun May 14, 2017 4:07 pm 
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I just got though cutting a bunch of Nanosital. It is the easiest material to cut and polish I have ever seen, and would be a wonderful confidence building stone for beginners.

72 Index:
Image

RI varies with color somewhat..vaguely around tourmaline. Not much dispersion, though, but takes a mirror polish instantly. Anything polishes it easily.

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 Post subject: Re: Tips on cutting Moissanite
PostPosted: Thu May 18, 2017 8:24 pm 
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lightbender57 wrote:
Who does the heat treatment????



And how much do they charge for the treatment?


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 Post subject: Re: Tips on cutting Moissanite
PostPosted: Sat May 20, 2017 2:40 pm 
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Gearloose wrote:
I just got though cutting a bunch of Nanosital. It is the easiest material to cut and polish I have ever seen, and would be a wonderful confidence building stone for beginners.

72 Index:
Image

RI varies with color somewhat..vaguely around tourmaline. Not much dispersion, though, but takes a mirror polish instantly. Anything polishes it easily.



This is very beautiful. What size stone is this?


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 Post subject: Re: Tips on cutting Moissanite
PostPosted: Sun May 21, 2017 12:43 pm 
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Tygurrr-I wrote:
Gearloose wrote:
I just got though cutting a bunch of Nanosital. It is the easiest material to cut and polish I have ever seen, and would be a wonderful confidence building stone for beginners.

72 Index:
Image

RI varies with color somewhat..vaguely around tourmaline. Not much dispersion, though, but takes a mirror polish instantly. Anything polishes it easily.



This is very beautiful. What size stone is this?


Nanosital

http://www.ebay.com/itm/Color-change-M-205-Green-Purple-74-gr-Monosital-Created-Gemstone-US-GEMS-/182546833450?hash=item2a80a3a02a:g:VYMAAOSwRUhZANTP

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 Post subject: Re: Tips on cutting Moissanite
PostPosted: Sun May 21, 2017 1:00 pm 
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gsellis wrote:
Tygurrr-I wrote:
Gearloose wrote:
I just got though cutting a bunch of Nanosital. It is the easiest material to cut and polish I have ever seen, and would be a wonderful confidence building stone for beginners.

72 Index:
Image

RI varies with color somewhat..vaguely around tourmaline. Not much dispersion, though, but takes a mirror polish instantly. Anything polishes it easily.



This is very beautiful. What size stone is this?


Nanosital

http://www.ebay.com/itm/Color-change-M-205-Green-Purple-74-gr-Monosital-Created-Gemstone-US-GEMS-/182546833450?hash=item2a80a3a02a:g:VYMAAOSwRUhZANTP


Ha?
No, no, I wanted to know the size of the stone.....many times, when I view fellow forum members work, I tend to envision their work in jewelry designs that I make up on the spot in my mind :lol:

That being said, I'm loving the CC material you just showed me! Thanks!


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 Post subject: Re: Tips on cutting Moissanite
PostPosted: Sun May 21, 2017 7:52 pm 
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Location: Pine City, NY and Dothan, AL
You can even get the material from Amazon. Seems to run 40 or 50 cents per gram.

The manufacturer, RusGems, describes it as "a multi-component high temperature composition on the base of two main oxides – SiO2 and Al2O3". They call it a glass, but they also say it's polycrystalline. It actually appears to be amorphous. Maybe something lost in the translation from Russian.


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 Post subject: Re: Tips on cutting Moissanite
PostPosted: Fri Jun 09, 2017 6:54 pm 
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Just checking,are Monosital and Nanosital the same material?

Sean

The quiet type....


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 Post subject: Re: Tips on cutting Moissanite
PostPosted: Sun Jun 16, 2019 7:58 am 
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Faceting 101 by Arya wrote:
Some quick tips:

1) Cuts like sapphire, but slower, with no orange peel
2) Gets super hot during polishing depending on how you do it
3) Can turn super brown during polishing for some of the different polymorphs or depending on the impurities
4) The treatment really, REALLY does a good job of whitening the material



Does this worth cutting moissanite for business?


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