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Cutting 0.5mm diamonds?


#1

What sort of machine would be used to cut these? I am talking about
fully faceted brilliant cuts, single cuts with near perfect symmetry
etc.

How can can they even adhere to a table, say,.35mm?

Phillip


#2

Most likely they are cut with a laser…

Craig


#3
Most likely they are cut with a laser..

Yes, but they still need to be polished and how?

Phillip


#4
but they still need to be polished and how?

They are cut by hands and not on fully automatic machines semi
automatic machines


#5

Would the original poster please explain how a laser cuts a diamond?
I understand how a laser can engrave an ID on a girdle; but cutting a
diamond with a laser or any stone for that matter escapes me.

KPK
PS: I have faceted every stone but a diamond.


#6

I have a couple dozen such diamonds I bought in India. In the main
diamond-cutting centre of Surat they specialize in these tiny grains
of dust… and they do them manually.

Unfortunately it’s mostly kids that do the cutting as they’re the
ones with the small enough hands and keen eyes.

When I magnified the stones I have I was stunned to see full SRB
cutting on the “larger” ones (the 1.25 pt diamonds) and a SRB
crown/simplified pavilion on the smaller stones (the smallest I have
is about 0.5 pt).

The stones themselves are pretty low-quality - yellowish in tone and
many have inclusions or “naturals” where the original crystal shape
was left to preserve weight. And the biggest problem with them is
their small size - a breeze or crackle in the stone paper is enough
to send them flying!

Pretty amazing when you think about the accuracy needed.

-Allan


#7

well im not the original poster but heres how it works, first you
should be familiar with the word laser. Light Amplification by
Stimulated Emission of Radiation. because this really is very
technical i will try to make it easy, by bouncing around photons in a
laser tube and applying an energy source you speed the photons up.
the resulting light beam is known as a laser. laser light can be
pulsed in very short frequency such as .000000000000010 of a second.
depending on the system it is being applied through the power source
is what makes the laser read something or cut it, for instance your
cd or dvd player runs around 5 mW whereas cutting lasers can run from
anywhere over 100W so when a beam or laser is very fine tuned at a
high power and is focused on anything it is designed to cut it
separates the proton/electron structure of that material thus cutting
it. much like a hot knife in butter but considerably more accurate.
of course the cutting power is controled by many things like power,
pulse time, material type of laser, and such but thats the basics

ken


#8

There are some stone cutters that specialize in cutting small stones
here in the U.S.! There was a very elderly gentleman at a Faceters
Convention in Mt. Vernon, Washington that cut as small as 1 ct.
stones regularly. It was quite astounding to watch! He polished also,
however, I don’t think he did diamonds!

Jim B.


#9
Would the original poster please explain how a laser cuts a
diamond? I understand how a laser can engrave an ID on a girdle;
but cutting a diamond with a laser or any stone for that matter
escapes me. 

I was the first, but Craig mentioned the laser. In my reading I also
found that laser can be used to saw diamonds and cut a basic shape.
I also read that in theory diamonds can be fully cut/polished by a
laser and it hasn’t been done yet.

The .02ct stones I have (hence this question) are quite perfect, E,
VS and better. I believe they were cut in Europe and they are made
specifically for high end watch makers…

Phillip


#10

They are cut manualy by semi automatic machines. In our factory in
India we specialise in cutting and polishing small diamonds and we
cut
about a thosand pieces everyday.

All these small diamonds are round brilliant and having full 57
facets. Our highly skilled workers can cut stones as small as 400 to
500 stones per carat. All these stones can be certified for exellent
cut, in propositions (ideal) and finish. Regarding child workers I
want to clarify that our goverment agencies are very particular that
no child labour exists and it is nearly abolished.

regards,
visvanath


#11
There was a very elderly gentleman at a Faceters Convention in Mt.
Vernon, Washington that cut as small as 1 ct. 

1ct is not all that small that’s about 5mm in size (if I’m reading
what you are saying correctly).

Craig


#12

There is hardly any production left for smaller stones in diamonds
in europe

Mainly they are cut in india, china, srilanka, malayasia, thailand,
vietnam, south africa and some in russia.

kumar


#13

Hi Ken…

What happens is not so much the speeding up of the photons…

It’s that the burst of light (the photons) are all in phase…i.e.
the term coherent light is applied to the laser beam…which makes
it a very special form of light…

That’s why it stays together enough to spot, or bounce and return
across vast distances, can cut stuff, etc.

Gary W. Bourbonais
A.J.P. (GIA)