Casting Diamonds Into Platinum "Stone In Place"

Sometimes we are asked about a trick we pulled off years ago to prove how good Docs really is. Okay here goes-Assuming injection wax only, and you will be casting diamonds "stone in place" very little changes. Put he diamonds in the wax just as you would in metal. Be sure to use decent diamonds, certain extensive flaws will lead to breakage. Do be neat-no sloppy wax work allowed. No special alloy is required-Just use 95/5 platinum.

You will keep the "burnout" down to 850 or 900 degrees F! This will hopefully avoid damaging the diamonds with excessive heat such as a 1300 degree burnout. That kind of heat will ruin any stone let alone diamonds. Some folks are brave enough to try this with other stones such as sapphire, but we make no guarantees here. So you keep the oven at 900 F and hold that long enough for all the wax to burn out. This is at least six hours.

Then you remove the flask, let it cool to 500F and cast as per usual. I have posted a picture or two from when we did this at our shop.

Comments

Resin Cad Cam or Photopolymers

For those most difficult resin Cad-Cam models... If you are using this material to simply overcome the defects that you encounter from the use of carving or RP waxes, you can just as well use a normal jewelry burnout cycle in the same oven as your normal daily production flasks. Method B: (Smaller flasks or small flask-less castings) Note: Casting flask-less is ideal with this type of material · Program your oven controller for a ramp rate from 4 degrees per minute to a maximum of 10 degrees per minute. This investment material is very resistant to shock so your ramp up speed can be faster than with gypsum-bonded investment. · About 1 hour after investing, put the flask into an oven that is preheated to about 300 o F (150 o C), with the wax button facing down. · Ramp directly up to your top burnout temperature of about 1350 o F - 1600 o F, depending on the metal you are burning out. For photopolymer...

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A close up of hydrogen as a fuel for smelting gold

A few images shot at our shop on GIA open house day. Once a year we have GIA students in through their alumni programs. The top picture shows the actual smelting of pure gold. Next is a shot of the gold being mixed with the alloy to make it into 18kt white gold. The next shot is that gold being vacuum cast. At bottom the raw 18kt white gold castings. The advantage of hydrogen for silver, gold and platinum is incredibly clean heat. 5000+ degrees Fahrenheit. Since hydrogen is an element as is oxygen, there is no carbon in the combustion as with natural gas, propane and acetylene. This illustrates how clean our environment could be if our primary fuel were hydrogen. The byproduct is pure water. One great precious metal that responds badly to hydrogen is palladium and palladium white gold.

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