Topaz/ Beryl- Key Terms
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Topaz/ Beryl- Key Terms

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Questions and Answers

What causes the wide variety of colors in topaz?

  • Traces of manganese
  • Traces of chromium
  • Heat treatment
  • Color centers and traces of chromium (correct)
  • What is the most rare and valuable variety of topaz?

  • Imperial, red and pink topaz (correct)
  • Imperial topaz
  • Red topaz
  • Pink topaz
  • What is the main purpose of heat treatment in Aquamarine?

  • To increase the value of the stone
  • To produce a pink color
  • To enhance the clarity of the stone
  • To remove the yellow color component, to produce a more marketable blue (correct)
  • What is the leading producer of aquamarine?

    <p>All of the above</p> Signup and view all the answers

    Why does topaz require special care in cutting, mounting, polishing and wearing?

    <p>Because of its cleavage</p> Signup and view all the answers

    What is the definition of imperial topaz?

    <p>A widely used trade term for gem-quality topaz of medium reddish orange to orange-red color</p> Signup and view all the answers

    What is the world's only known source of red beryl?

    <p>Utah, USA</p> Signup and view all the answers

    What is the purpose of heating yellow to reddish brown topaz?

    <p>To produce a pink color</p> Signup and view all the answers

    What is a common morganite treatment process?

    <p>Almost always heated, or irradiated first and then heated, to produce or improve the pink color</p> Signup and view all the answers

    What is the major commercial source of imperial and red topaz?

    <p>The Ouro Preto area of Brazil</p> Signup and view all the answers

    What is the trade term for orange-to-yellow and brown topaz ?

    <p>Precious Topaz</p> Signup and view all the answers

    What distinguishes green beryl from emerald ?

    <p>Tone and Saturation levels</p> Signup and view all the answers

    What is the trace element of red beryl ?

    <p>Manganese</p> Signup and view all the answers

    What is the common color of Topaz ?

    <p>Colorless</p> Signup and view all the answers

    Common Topaz treatments are...?

    <p>Heating or a combination of heating and irradiation</p> Signup and view all the answers

    In what state does aquamarine shows its finest, most saturated color?

    <p>Large Sizes</p> Signup and view all the answers

    Due to its crystal structure, what cut(s) is common for topaz ?

    <p>Long Ovals, Pearls or Emerald Cut</p> Signup and view all the answers

    The finest Aquamarines are ...?

    <p>Moderately Strong, medium-dark blue to slightly greenish blue</p> Signup and view all the answers

    What are the most important factors for buyers of treated blue topaz ?

    <p>Price and uniformity</p> Signup and view all the answers

    Study Notes

    Topaz

    • Red and pink topaz varieties, including imperial topaz, are the most rare and valuable.
    • Color centers and traces of chromium cause the wide variety of colors in topaz.
    • Topaz crystals are often cut as long ovals, pears, or emerald cuts due to their elongated shape.
    • Topaz requires special care in cutting, polishing, mounting, and wear due to its cleavage.

    Treatment of Topaz

    • Virtually all topaz is treated to produce a blue color.
    • Treatment involves heating or a combination of heating and irradiation.

    Aquamarine

    • The finest aquamarines are a moderately strong, medium-dark blue to slightly greenish blue.
    • Brazil, Pakistan, and China are leading producers of aquamarine.
    • Virtually all aquamarine is heat-treated to remove the yellow color component and produce a more marketable blue color.

    Imperial Topaz

    • The definitions of imperial topaz can vary widely.
    • The Ouro Preto area of Brazil is the world’s major commercial source of imperial and red topaz.

    Other Beryls

    • Morganite is almost always heated, or irradiated first and then heated, to produce or improve the pink color.
    • Traces of manganese cause red beryl’s color.
    • The US state of Utah is the world’s only known source of red beryl.
    • Tone and saturation levels distinguish green beryl from emerald.

    Key Terms

    • Imperial topaz: A widely used trade term for gem-quality topaz of medium reddish orange to orange-red color.
    • Precious topaz: A trade term for orange-to-yellow and brown topaz.

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    Description

    This quiz covers various types of colored stones, including topaz and aquamarine, their characteristics, and features that affect their value.

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