Ruby - Key terms
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Questions and Answers

What is the ideal jewelry type for rubies due to their hardness?

  • Formal event jewelry
  • Occasional wear jewelry
  • Frequently worn jewelry (correct)
  • Special occasion jewelry

    • Why is laboratory analysis required for Beryllium lattice diffusion in Ruby's ?

  • To identify the source of the ruby
  • Because it is difficult to detect (correct)
  • To detect clarity enhancement
  • To detect lead-glass treatment

    • What is the cause of fluorescence in rubies?

  • The presence of lead
  • The presence of iron
  • The presence of chromium (correct)
  • The presence of beryllium

    • What is the primary source of the world's rubies?

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

    Why should a stone not be described by its source name?

    <p>Unless you're sure the stone came from that source</p> Signup and view all the answers

    What is the most important ruby source?

    <p>The Montepuez area of Mozambique</p> Signup and view all the answers

    Why do rubies typically form in marble deposits?

    <p>Due to the geological formation process</p> Signup and view all the answers

    What is the purpose of heat-treating rubies?

    <p>To improve color and clarity</p> Signup and view all the answers

    Which of the following is NOT a major ruby cutting and trading center?

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

    What is the effect of high levels of iron in basalt-hosted rubies?

    <p>It inhibits fluorescence</p> Signup and view all the answers

    What is the most valuable ruby color?

    <p>Red to purplish-red</p> Signup and view all the answers

    What is the typical Mohs hardness scale rating of ruby?

    <p>9</p> Signup and view all the answers

    What treatment is not stable, and can affect the appearance of a ruby over time?

    <p>Clarity enhancement</p> Signup and view all the answers

    What is the significance of Thailand in the ruby industry?

    <p>It's the largest ruby cutting and trading center</p> Signup and view all the answers

    What is the common practice with regards to heat-treating rubies?

    <p>Almost always heat-treated</p> Signup and view all the answers

    What is the primary factor that determines the value of a ruby?

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

    What is the significance of Mogok, Myanmar?

    <p>It's the most historically important ruby source</p> Signup and view all the answers

    What is the characteristic of lead-glass treated rubies that are considered composites or manufactured?

    <p>High proportions of filler</p> Signup and view all the answers

    Why is Africa replacing Southeast Asia as the primary source of rubies?

    <p>The reason is not specified in the text</p> Signup and view all the answers

    What is the common association between chromium and rubies?

    <p>Chromium causes rubies to be red</p> Signup and view all the answers

    What is the characteristic of the finest rubies?

    <p>Formed in marble deposits</p> Signup and view all the answers

    When can Ruby's command. the highest price per carat of all colored stones?

    <p>When untreated</p> Signup and view all the answers

    Ruby deposits in Thailand and Cambodia are associated with ...?

    <p>alkali-basalt</p> Signup and view all the answers

    The Central Asia, Afghanistan and Tajikistan rubies are found in what type of deposit ?

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

    Low temperature heat treatment sometimes ........?

    <p>Improve ruby's color</p> Signup and view all the answers

    The introduction of the first synthetic ruby's did what ?

    <p>Destabilized the natural gem market</p> Signup and view all the answers

    Study Notes

    Ruby Characteristics

    • Ruby rates 9 on the Mohs hardness scale, making it ideal for frequently worn jewelry.
    • The most valuable ruby colors are red to slightly purplish red with medium to medium-dark tone and vivid saturation.
    • Chromium, a trace element, causes rubies to be red and can also cause fluorescence, which intensifies body color.

    Treatment and Enhancement

    • Beryllium lattice diffusion is difficult to detect and often requires laboratory analysis.
    • Clarity enhancement is not stable and a treated ruby's appearance might change over time.
    • Lead-glass treated rubies may contain a high proportion of filler, making them considered composites or manufactured products by gem labs.

    Sources and Markets

    • Thailand is the world's largest ruby cutting, treatment, and trading center.
    • Africa has replaced Southeast Asia as the source of the majority of the world's ruby.
    • The Montepuez area of Mozambique is the world's most important ruby source.
    • Mogok, Myanmar, is the most historically important ruby source.
    • Mines in Mong Hsu, Myanmar, supplied most of the world's commercial-quality rubies through the 1990s.

    Notable Facts

    • Rubies are almost always heat-treated to improve color and clarity.
    • Along with Thailand, the world's major ruby cutting and trading centers include China, Sri Lanka, and India.
    • Never describe a stone by a source name unless you're sure the stone came from that source.

    Ruby Characteristics

    • Ruby rates 9 on the Mohs hardness scale, making it ideal for frequently worn jewelry.
    • The most valuable ruby colors are red to slightly purplish red with medium to medium-dark tone and vivid saturation.
    • Chromium, a trace element, causes rubies to be red and can also cause fluorescence, which intensifies body color.

    Treatment and Enhancement

    • Beryllium lattice diffusion is difficult to detect and often requires laboratory analysis.
    • Clarity enhancement is not stable and a treated ruby's appearance might change over time.
    • Lead-glass treated rubies may contain a high proportion of filler, making them considered composites or manufactured products by gem labs.

    Sources and Markets

    • Thailand is the world's largest ruby cutting, treatment, and trading center.
    • Africa has replaced Southeast Asia as the source of the majority of the world's ruby.
    • The Montepuez area of Mozambique is the world's most important ruby source.
    • Mogok, Myanmar, is the most historically important ruby source.
    • Mines in Mong Hsu, Myanmar, supplied most of the world's commercial-quality rubies through the 1990s.

    Notable Facts

    • Rubies are almost always heat-treated to improve color and clarity.
    • Along with Thailand, the world's major ruby cutting and trading centers include China, Sri Lanka, and India.
    • Never describe a stone by a source name unless you're sure the stone came from that source.

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