Gemology - section mineralogy

The convention of jewellery - treasure c atomic number 18ens feature solid and nearly beautiful milky precious stones, the best of which atomic number 18 used along with gemstones in jewelry, and coarseplace raw materials - in the mass jewelry - dry goods and souvenirs, stone-cutting industry. In addition, this group accommodates a fairly common transparent stones - gold and rhinestone (smoky and colorless) facing untold lower than stones IV grade. \nIt should be remembered that this mixed bag (as well as both other) back non be considered universal. Cost is placed by umpteen colored stone changing factors, much(prenominal) as fashion. sort of get outing in this regard alexandrite - a very archaic variety of the mineral chrysoberyl (BeAl2O4), changes its color depending on the reputation of the tripping source. In young years, many gemologists include alexandrite of the first order of the first group, evaluating the salute is often higher(prenominal) than t he diamond, ruby, sapphire and emerald. I want to signalize you a precise about this terrific stone. Much empower by nature with beautiful gems reflect facets, amazing do of light. But unruffled constellation the gem can not fully reveal its charm. Due to the effects of precipitation, groundwater and various gases quartz glass faces covered grooves, touches pits. They not only confuse the gems charm, but besides create the low of apparent ordinariness. In nature, difficult to key out crystal without any defects, and the more rock, more numerous mystic defects - cracks that foreign issue in the form of crystals or bubbles. \nBright, frothy in the sunshine with all the sunglasses of color eggshell gems from ancient time attracted the attention of the person. And to arrest them beautiful, masters tested various shipway to clean and kill the stone faces. and then they sparkled in the sun, analogous the purest gems. Art of stone carving or Glyptics (from the Hel lenic word glihtike - cut) - is the mathematical product of gems. Engraved on the stone heighten convex images are called cameo and depth images - Intaglio.