38 results about "Moissanite" patented technology

Diamond look-alikes like cubic zirconium, moissanite and other synthetic stones, are distinguishable from nature diamonds based on their thermal and / or electrical conductivities. Germ testers that are on the market are capable of evaluating these two parameters as is the present invention. Electrical resistance of moissanites reaches hundreds of thousands megohms. Existing gem esters use test voltage of 1000 volts, to be able to detect electrical conductivity in most moissanites. Still, reliable detection of high resistance moissanites is difficult. Proposed invention uses significant photo conductivity of moissanites, which was observed by the inventors, to facilitate measurement of electrical conductivity in the toughest gems, to reduce test voltage applied to gems to 300 volts, and to limit electrical test current through a gem to no more than a few micro-amps. Other refinements include: (1) multistep evaluation of electrical conductivity, which avoids applying excessive or unnecessary test voltage and current to a gem, (2) circuit design, which efficiently attenuates AC noise, (3) signal processing, which eliminates industrial pick-up, (4) usage of reference temperature sensor, which improves sensibility and repeatability of thermal measurements.

The invention relates to substitutes of real gems for the purpose of calibrating of commercial diamond testers and for verification of their correct operation. Suggested apparatus consists of a set of objects, which are made of cheap materials like brass, stainless steel, and electrically conductive rubber, and which exhibit combination of thermal and electric conductivities typical for diamonds and their popular imitations like moissanites, cubic zirconia, and others.

The invention relates to a moissanite gem with bright carving surface and cutting and grinding processing methods of the moissanite gem. For the moissanite gem, the crown angle is 34-35 degrees, the pavilion angle is 41-42 degrees, the table width is 49%-51%, the crown height is 17%-18%, the pavilion depth is 43%-44%, and the total depth is 62%-65%. The methods comprise cutting and grinding angle and proportions of various common bright cutting types of moissanite gems. According to specific properties of crystal axis orientation, refractive index, color, color, transparency and the like of the moissanite gems, after the cutting and grinding angles and proportions are adopted, comprehensive and optimized gloss, flicking and color of the curved-surface moissanite gems are displayed.

The invention discloses a preparation method of a moissanite blade material. The preparation of a moissanite particle material with a diameter of 0.45-0.5 [mu]m is mainly carried out according to thesteps of ''hammer crusher crushing -> ball mill crushing -> steam flow medium crushing and grading -> moisture grading and impurity removal -> pressure filtration dewatering -> drying and packaging''.When the material is in an jet mill, the high temperature and high pressure water vapor and the silicon carbide medium balls work together, so that the collision speed of logistics is accelerated, the shortage of logistics vectors is avoided, the electrostatic aerosol layer generated on the surface of moissanite during the crushing process is effectively removed, and moissanite is crushed into ultra-fine micro-powders with a median particle size of 0.6 [mu]m. According to the preparation method, the crushing effect on the silicon carbide raw material is good, and the crushing efficiency is high, so that the method is beneficial to the deep processing production of moissanite, and new functions of the product can be further developed.