First the stone's diameter is measured at the pavillion and a dent is made in the metal for the pilot drill (about 1mm diameter). Then the metal is drilled through. The metal is drilled again until the hole is about 3/4 the size of the stone's diameter. Lubricate the drill bit. As long as there is a 0.3 mm seat left there is enough to set with.... (2002) Complete Story
Patination is a technique which has become popular for some kinds of fashion jewellery in recent years. Usually a patina requires the application of a toxic chemical mixture or the conversion of the metal surface to a salt of it's metal. For most patinations then good ventilation and a knowledge of chemistry is necessary. There are however a number of old patination techniques which are based on a simple.... (2002) Complete Story
Have a fire plan; ask your fire department for advice. Keep the appropriate extinguishers around and in good shape. Get ABC all-purpose extinguishers. Get the manufacturers manual and read all the instructions carefully at least three times. Review your fire safety now and then. Make sure you know how to use an extinguisher properly, sweeping back and forth at the base of the fire from 6-10 feet away. Realize that your extinguisher will only work for 15-20 seconds, so have more than one around. Mount them near exits. Dry chemical extinguishers of the stored pressure kind need to be.... (2002) Complete Story
First the stone's diameter is measured at the pavillion and a dent is made in metal for the pilot drill (about 1mm diameter). Then the metal is drilled The metal is drilled again until the hole is about 3/4 the size of the diameter. Lubricate the drill bit. As long as there is a 0.3 mm seat left there enough to set with. It is an easy mistake not to take out enough metal, 3/4 of diameter of the stone is probably a bigger final drill bit than you think. Hold it top of the stone to see how much stone sticks out on each side of the bit.... (2002) Complete Story
The optical characteristics and properties of gemstones often provide the fastest and best methods of identification. A certain amount of theory is necessary as optical principles determine cutting methods, gemstone attributes and the function of gem testing instruments.... (1994) Complete Story
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