Some Techniques Used In Buying Second-Hand Jewelry By Indra Jhaveri
These elements of stone and metal types and manufacturing processes all play into the evaluation of worth and value. To contact Indra Jhaveri, send email to amidiamond@live.com or visit www.amidiamondsandjewelry.com. One can also reach him at (602) 923-8200 or (602) 432-2920.
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Buying second-hand jewelry requires close examination and analysis. One must consider the type and quality of all the gem materials, metals and manufacturing processes to determine value. Stones must be identified and metal type determined. Identifying stones requires visual examination using a 10x loupe or microscope and frequently, the use of a refractometer, polariscope, dichroscope, spectrometer and/or specific gravity liquids. Some electronic devices exist to help discriminate between diamond and its simulants; C.Z., moissanite, and even synthetic white sapphire. Very specialized equipment exists to separate natural diamonds from man-made diamonds. There are hundreds if not thousands of materials that can be used in jewelry. The value of a gem material depends upon material type, color, inclusions in transparent material and the quality of cutting and polishing. Metals used in jewelry are typically alloys. Alloys are combinations of different types of metal that affect purity, alter appearance and improve workability. The acid test is a classic technique using different types of acids to test the reaction of a tiny bit of metal, scratched onto a black stone. Each alloy reacts differently to the different liquids used. Modern metal testing methods include devices that test thermal or electrical conductivity. Karat gold and sterling silver are used for fine jewelry and base metals or even plastics are used for costume jewelry. The type and quality of manufacturing is also an important element of value. Some of the finest pieces are entirely hand fabricated and completely unique and one-of-a-kind. Most jewelry is fabricated on a larger scale. With the casting technique, a master model is made, a mold created and then wax is used to create models that are cast in the required metal. In the stamping technique, a design is carved into steel. Metal placed into this type of mold is shaped using very high pressure to push the metal into the impression. Both of these methods allow the replication of the same image. Different amounts of hand finishing are required to set stones and polish the final product.
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