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The award-winning Journal is published monthly by MJSA, the trade association for professional jewelry makers, designers, and related suppliers. Before you accept the job, fully inform the customer about what you will and will not be responsible for if the stone is damaged. In repair take-in situations, make sure the customer understands that topaz can cleave in the process of repair.
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Make sure the client understands that topaz is not an appropriate stone for the gym or the garden. Sharp blows, especially to rings and bracelets, often result in a broken topaz. This type of damage is obvious and should be avoided by using files with safety edges and doing as much sanding and filing as possible prior to stone setting.
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The most common tool damage on a topaz takes the form of small chips along facet junctions, again due to the cleavage. Designs should also be engineered in a way that protects the topaz from any sharp blows during normal wear.įiles and burs can cause scratches on the stone. Channel settings are difficult, as pushing the girdle edge of the stone into the channel is a perfect opportunity to cleave the stone. Use slightly thinner stone settings or more malleable alloys. The design of a piece of topaz jewelry should take into account the stone’s tendency to cleave. Cut stone seats with care and smooth away any burrs left by tools. To minimize the risk, avoid alloys that are very hard, as well as overly thick prongs. Setting a topaz in prongs presents a greater risk than tightening. Routine stone tightening on a prong set topaz can result in cleaving the stone. Hammering or putting pressure on a topaz runs the risk of cleaving the stone into pieces. The primary issue with topaz that must be remembered at the bench is its one perfect cleavage direction. Just be sure that you are very comfortable with the possibility of having to replace the stone. If the stone is a stock size and color that is easily replaceable, you may feel confident enough to steam and ultrasonic clean. If dealing with a hard to replace pink “Imperial” topaz, a customer’s stone, or a custom cut stone, the safest course of action is to clean the jewelry with a soft brush and warm soapy water. Cleaning in a steamer or ultrasonic can cause damage in stones with fractures or liquid inclusions. Topaz has one direction of perfect cleavage that makes it prone to breakage (especially if fractures are present). This topaz was damaged when moderate pressure was applied to a small cleavage. Blues, yellows, browns, reds, greens, and iridescent examples of coated stones are available. Treatment of topaz with thin film coatings results in any color. The most common treatment is the irradiation of colorless or very light yellow topaz to cause blue color. Mohs Hardness: 8 Cleavage/Fracture: one direction of perfect cleavage Enhancements Topaz is found in many areas around the world, with South America and Sri Lanka leading production. Colorless topaz is an historic diamond imitation. “Imperial” topaz is a pink-orange color that is reminiscent of zinfandel wine. Topaz is commonly yellow, orange, or brown in color.
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