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Gemstone cutting and lamination


#1

OK, this is a bit of a repost from the old Orchid and also just to get the feel of the new site, which I really like a lot.


First, the finished stone.

I select the material.
A piece of Brazilian amethyst and a piece of Zimbabwean aquamarine.

Then I carve them into two shapes that are mirror images.
I only concentrate on the inner curves at first
.
Normally, if I have to set an expensive emerald or some other delicate stone, I use a spray powder called seat check.
It’s a green powder that sprays out and coats the seat the metal and the bottom of the gemstone being set.
So the metal seat is marked and then you know where to remove metal
With patience and a billion sprays, you can an unusually shaped stone to sit absolutely where you wanted it.
It also works well for gem carving because you can see on the left side of the piece, the powder discolours where it touches, so that where you grind material off.

High tech clamp.
I use HXTAL resin to laminate the two sides together.
I takes five days to harden.
I put masking tape on the clamp because if the resin comes into direct contact with the stone and the clamp, it breaks the stone before it releases.

I also weaken the clamp by annealing the back part so that it holds the two pieces more gently.

Once the resin is hard the stone is ready for pre forming.

The resin ground off.
Now I dop the stone and cut it on my Imahashi gem cutting machine.
I was going to cut this stone into an oval, because an oval reflects light in a bow tie shape along a center spine.
I thought that the ‘bow tie’ would change colour as it ran down the center.
But the amethyst developed a surface crack, so I had to make it’s shape round.
With round, there comes a more even reflection of light which is not really what I wanted.
No matter, you go with the flow.

This picture was taken under an incandescent light.
I was cutting on copper with 7000 grit.
I clearly shows the different cutting surfaces between quartz and beryl.
The polishing rate is nearly the same, with the quartz lagging a bit behind.
I use a Batt lap with 50,000 diamond grit for polishing.

View from the back of the gemstone.

The stone came out at 10 mm in diameter and 3.6 carats in weight
Hans Meevis


#2

@hans870 thank you for posting this! You’ve demonstrated exactly how the new Orchid is best utilized. If you are on your phone and logged in, you can literally select photos or videos right from your phone’s library and upload them. Likewise, if you are on your desktop, you can drag and drop things right into a post and they will be handled and formatted appropriately for you.

The rich formatting and media options really are extensive. A bit of a learning curve, but posts like this are just awesome, and worth it!


#3

Always a joy to see your projects man!!