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by vegasjames
www.gia.edu/doc/Synthetic-Gem-Materials-in-the-2000s.pdf
by vegasjames
From the FTC:

www.ftc.gov/business-guidance/blog/2019/04/warning-letters-re-mined-diamond-sellers-describe-products-accurately

"The Guides caution marketers not to use the name of any precious stone, including diamonds, to describe a simulated or laboratory-created stone, unless the name is immediately preceded by a clear disclosure of the nature of the product and that it’s not a mined stone. The Guides put it this way:

It is unfair or deceptive to use the word “ruby,” “sapphire,” “emerald,” “topaz,” or the name of any other precious or semi-precious stone, or the word “stone,” “birthstone,” “gem,” “gemstone,” or similar term to describe a laboratory-grown, laboratory-created, [manufacturer name]-created, synthetic, imitation, or simulated stone, unless such word or name is immediately preceded with equal conspicuousness by the word “laboratory-grown,” “laboratory-created,” “[manufacturer name]-created,” or some other word or phrase of like meaning, or by the word “imitation” or “simulated,” so as to disclose clearly the nature of the product and the fact it is not a mined gemstone.


The warning letters also advise marketers not to describe simulated diamonds in a way that may falsely imply they have the same optical, physical, and chemical properties of mined diamonds. Here’s the relevant provision in the Guides:

It is unfair or deceptive to use the word “laboratory-grown,” “laboratory-created,” “[manufacturer name]-created,” “synthetic,” or other word or phrase of like meaning with the name of any natural stone to describe any industry product unless such product has essentially the same optical, physical, and chemical properties as the stone named."

"Clarify your use of “diamond.” According to FTC staff, some ads showed pictures that appear to be diamond jewelry or use the word “diamond” without disclosing close to the product depiction or name, or in the product description, that it was a lab-created or simulated stone. Hashtags and URLs can convey claims, too. That’s why advertisers who sell lab-created or simulated products should exercise caution about using #diamonds or domain names that include the word “diamond.”

Don’t assume that consumers will understand your marketing terminology. Some of the warning letters went to companies that described their lab-created or simulated stones with proprietary phrases that FTC staff thought could be deceptive to consumers without more explanation. Advertisers should avoid lingo that could leave buyers with a misimpression about the nature of the product.

Keep your descriptions consistent. In one Instagram ad cited in the warning letters, the company described some of its diamonds as “cultured” and others as “lab grown.” FTC staff was concerned that the inconsistent descriptors could create a false impression in consumers’ minds that the “cultured diamonds” are mined, rather than laboratory-created."
by creativeness718
MadMax Avatar
creativeness718 Avatar
It's a Jenkins "royal" saw.

Check the bearing carrier, make sure it's tight to the arbor
Thanks for the info!

Is there any way to tell what size blade it was designed for? The current 16" blade has barely more than an inch of clearance from the back housing. I'm not sure how close you are supposed to get.



They sold a 14/16 and a 18". Might fit an 18", looks like an 18" model 2 based on the bearing carrier
by vegasjames
gemfeller Avatar
vegasjames Avatar
That does verify what I mentioned earlier about extracting the carbon from the rest of the cremation ashes.

One thing I would question in this article though is where the author writes:

"Furthermore, just like with other types of lab-made diamonds, the Federal Trade Commission has confirmed that cremation diamonds can be marketed as real and genuine diamonds because, just like “natural” diamonds, they are “pure carbon crystalized in the isometric system.”"

The reason is that these are not natural diamonds, they are synthetic diamonds. And the FTC does not allow other synthetic gemstones to be referred to as "real", which implies natural. Synthetic stones such as sapphires including ruby, alexandrite, etc. have to be listed as synthetic stones or lab grown, not as real stones.

Same with simulants such as diamond substitutes such as YAG or aluminum oxide "diamonds", which must be marketed as simulants.


The whole issue of man-made, synthetic, natural etc. has created a semantic maze for the FTC. Here's a couple of articles that go into the new rulings by the FTC regarding man-made diamonds. Apparently the term "synthetic" is no longer required for lab-made gems that are chemically identical to mined stones, if I read correctly.

www.forbes.com/sites/pamdanziger/2018/08/02/what-the-ftc-diamond-ruling-means-for-consumers-and-diamond-marketers/?sh=4ac6fdb020fa

nationaljeweler.com/articles/956-a-quick-review-of-the-ftc-s-rules-on-lab-grown-diamonds



The Forbes article really sucks. For instance, they imply something synthetic is fake, which is not true. Again, if a sapphire is synthesized that does make it fake. It is still real sapphire, it has just been produced synthetically.  If it were a simulant instead of a synthetic, then it would be fake.

And their claim that you cannot synthesize elements it total bullshit.  For example, it is super simple to synthesize carbon by burning sugar with a torch.  Pure copper can be synthesized by reducing copper oxide through high heat in the presence of hydrogen gas.  I can give numerous other examples.

As for diamond, the process of chemical vapor deposition (CVD) is synthesizing carbon from methane, which is then synthesized in to a crystalline form.  I first heard of CVD diamonds over 30 years ago, and experimented with a similar process at the time. Originally the process involved using a heated tungsten coil to knock the carbon out of methane forming diamond.  Later then went to microwaves to do the same thing. Changing the gas methane to free carbon and hydrogen gas is synthesis.

At no point in the article though did they say anything about lab grown diamonds can be old simply as diamond.

As for your second article,  they back what I was saying where I wrote:

"The FTC says they still must make it clear that the product is man-made by using “clear and conspicuous” disclosure with the word diamond; the three terms the FTC recommends using are laboratory-grown, laboratory-created or [manufacturer name]-created.

Cultured is OK too, but it has to be “immediately accompanied, with equal conspicuousness” by one of the three terms; it cannot stand alone.

When “diamond” appears by itself, it still means a natural diamond."

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