Podcast
Questions and Answers
What is the ideal jewelry type for rubies due to their hardness?
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 ?
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?
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?
What is the primary source of the world's rubies?
Why should a stone not be described by its source name?
Why should a stone not be described by its source name?
What is the most important ruby source?
What is the most important ruby source?
Why do rubies typically form in marble deposits?
Why do rubies typically form in marble deposits?
What is the purpose of heat-treating rubies?
What is the purpose of heat-treating rubies?
Which of the following is NOT a major ruby cutting and trading center?
Which of the following is NOT a major ruby cutting and trading center?
What is the effect of high levels of iron in basalt-hosted rubies?
What is the effect of high levels of iron in basalt-hosted rubies?
What is the most valuable ruby color?
What is the most valuable ruby color?
What is the typical Mohs hardness scale rating of ruby?
What is the typical Mohs hardness scale rating of ruby?
What treatment is not stable, and can affect the appearance of a ruby over time?
What treatment is not stable, and can affect the appearance of a ruby over time?
What is the significance of Thailand in the ruby industry?
What is the significance of Thailand in the ruby industry?
What is the common practice with regards to heat-treating rubies?
What is the common practice with regards to heat-treating rubies?
What is the primary factor that determines the value of a ruby?
What is the primary factor that determines the value of a ruby?
What is the significance of Mogok, Myanmar?
What is the significance of Mogok, Myanmar?
What is the characteristic of lead-glass treated rubies that are considered composites or manufactured?
What is the characteristic of lead-glass treated rubies that are considered composites or manufactured?
Why is Africa replacing Southeast Asia as the primary source of rubies?
Why is Africa replacing Southeast Asia as the primary source of rubies?
What is the common association between chromium and rubies?
What is the common association between chromium and rubies?
What is the characteristic of the finest rubies?
What is the characteristic of the finest rubies?
When can Ruby's command. the highest price per carat of all colored stones?
When can Ruby's command. the highest price per carat of all colored stones?
Ruby deposits in Thailand and Cambodia are associated with ...?
Ruby deposits in Thailand and Cambodia are associated with ...?
The Central Asia, Afghanistan and Tajikistan rubies are found in what type of deposit ?
The Central Asia, Afghanistan and Tajikistan rubies are found in what type of deposit ?
Low temperature heat treatment sometimes ........?
Low temperature heat treatment sometimes ........?
The introduction of the first synthetic ruby's did what ?
The introduction of the first synthetic ruby's did what ?
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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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