3d printable gold/platinum tweezers
: Scratch resistance on gemstones
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Material: Gold has a 3 rating while platinum has 4-4.5 in scratch resistance compared to titanium, the most scratch resistant material with a rating of 6
Research: "It may unnecessary seem to be careful in this matter, but it is better to be over careful than to make a mistake where every hundredth of a carat may mean from one to five or six dollars or more. No dealer can afford to have a stone that he has sold prove to be lighter than he has stated it to be. One should be atleast one one hundredth of a carat of the correct weight. It should be unnecessary to add the accurate weights should neve be handled with the fingers.
I vory tipped forceps are best for handling weights by scratching them so they will weigh materially less. Unless the weights are of platinum of plated with gold, the perspiration of the hands will cause them to oxidize and gain in weight. It would be well to discard the smaller weights that are most in use, every few years and obtain new and accurate ones" (Wodiska, Julius, The book of precious stones
Info on gemstones (refractive index, specific gravity etc)