What is PRECISION CUTTING (vs Hand Cutting and Machine Cutting)?

This video explores different types of nomenclature for gem cutting quality and how it varies in different parts of the world. One thing I forgot to mention is that sometimes "precision cut" implies faceted girdles in the case of mast machine cut stones which is another reason why I don't like to use the term. Also I don't talk about "competitio" cutting" because this video is only talking about cutting for the jewelry trade and competition cutting is done with different standards and different time constraints that usually have little to do with the jewelry industry. Enjoy!

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[bwana]

Justin, Great video. Over the years I have often had to have this very conversation with people about cutting. It has been my position that no matter what type of machine was used to cut, or what pattern (style) a stone was cut in, the important distinction in calling something precision cut lay in what I refer to as the "workmanship". Too many have maintained that precision cut means that the pavilion must come to a pointed culet, or that the term somehow referred to a meet point style of cutting. To me precision "workmanship" refers to a set of tolerances that encompasses proportions, brilliance, symmetry, meet point tolerance, and polish factors. This is very much in alignment with G.I.A.'s colored stone grading criteria. I have cut this way on my Jamb peg, handpiece, and mast machines. Steve

[arvidjohanstusvik]

I totally agree with you. I'm faceting on a homemade machine, with one of these cheap Chinese faceting devices.
Many people say..no no .. that's some gear that's impossible to use .. But i can make high quality stones on that machine. .of course if i take my time making it 100% ..
I have cut 147 facets Portuguese cut stones without missing a single meetpoint.

So it's all about getting familiar with your equipment, being self critical, being patient and doing your best.

[raeleenrobinson]

I like the orange one! Very nice colour

[boblakey]

Nice video Justin, good explanation, long overdue!

[CoraleenWaddell]

super informative! thanks for this vid

[makenchips]

You did an excellent job in explaining everything! So well done but in your examples I wish you would have had some pointer that would show us what those errors were because all the stones look pretty good in the video maybe you can do another video what does under magnification exactly what you're talking about I understand but I couldn't see it like you could. Also a description of price point per carat based the quality would have been good to understand to, but well done, enjoyed the video very much Columbus Michigan

[donscott]

I cut my gems on a flat lap without a manipulator I call that hand cut generally the stone is big enough to fit in your hand and usually not very small at all

[oddmade]

GREAT video - very useful indeed - thank you Justin

[mohamedriflan]

Well explained..
Thanks👍 Justin K Prim

[benjamindejonge]

Love this ambiguous options, but yes if there’re loupe correct what more do you want? But yes there is a difference between a potato or Swiss cut

[sinceresincere-thdt]

Justin tell me what kind of a machine should I buy? I am new in this hobby and I bought a machine from the stupid Vevor in canada and parts of the machine were all garbage and they have decided to give half of the money back because it is too expensive to send it back to china and get an other one.

[hamedrahmati]

thank you, your videos are excellent, please make video about ground girdles and how to grind a faceted girdle make a round and smooth girdle, specially on oval and pear shapes.

[Breed]

Thank you Justin, Iearning from your videos🙏❤🇹🇭😇

[geoffgeoff]

In the western world, I would say hand cut is any form of mast, quadrant, jamb peg, etc. Machine cut is CNC. Precission cutting is vague but just a better quality cut.

[ranvaknin]

I love your channel so much. Well done sir.

[Liburni]

just like that, it’s more to a good artist than to machines

[superfluity-of-naughtiness]

Just wondering...at time stamp 6:20 Justin refers to that stone as a "sapphire"??? its pretty clearly a medium red (with a purplish modifier) stone...Unless my TV is way off, isnt that clearly a ruby?

[derrviel]

Is it true that a really well cut sapphire will not darken when it is set in a ring?

[idonthaveaname]

I've heard of laser cut before too. Whats that?

[jerricklescano]

How much price in orange diamond sir thakyou