Podcast
Questions and Answers
What is responsible for the color change in sapphire?
What is responsible for the color change in sapphire?
- Iron
- Titanium
- Chromium
- Vanadium (correct)
Which type of sapphire typically has the highest per-carat value?
Which type of sapphire typically has the highest per-carat value?
- Star ruby
- Blue star sapphire
- Padparadscha (correct)
- Pink sapphire
What is the typical color change of corundum in different lighting conditions?
What is the typical color change of corundum in different lighting conditions?
- From blue or violet in daylight to violetish purple to strongly reddish purple in incandescent light (correct)
- From violet to blue in daylight to pinkish purple in incandescent light
- From blue to violet in daylight to reddish purple in incandescent light
- From red to orange in daylight to yellowish orange in incandescent light
What is a common treatment for purple sapphires?
What is a common treatment for purple sapphires?
What is the market status of green sapphire?
What is the market status of green sapphire?
Which country is known for producing a wide range of fancy sapphire colors?
Which country is known for producing a wide range of fancy sapphire colors?
What type of sapphire is often produced through beryllium diffusion?
What type of sapphire is often produced through beryllium diffusion?
Which type of star corundum is typically the most valuable?
Which type of star corundum is typically the most valuable?
What star sapphire cost much less than star ruby of the equivalent quality ?
What star sapphire cost much less than star ruby of the equivalent quality ?
What differing amount of what trace elements cause most fancy sapphire ?
What differing amount of what trace elements cause most fancy sapphire ?
What fine sapphire hues commands top prices comparable to padparadschas ?
What fine sapphire hues commands top prices comparable to padparadschas ?
The finest star sapphires are ......?
The finest star sapphires are ......?
What country is the major resource of high quality pink sapphire?
What country is the major resource of high quality pink sapphire?
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Study Notes
Colored Stones: Key Concepts
- The colors of fancy sapphires are primarily caused by varying amounts and combinations of the trace elements iron, titanium, and chromium.
- Vanadium is the trace element responsible for sapphire's color change.
Sapphire Colors and Values
- Padparadschas typically have the highest per-carat value of all fancy sapphires.
- Fine pink sapphires often command top prices, comparable to padparadschas.
- Purple sapphires are often heat-treated to achieve a more valuable pink or red hue.
- Green sapphire is abundant but has low market value.
History of Sapphire Marketing
- Colorless sapphire was once marketed as an inexpensive natural substitute for diamond.
Corundum Color Change
- The typical corundum color change occurs from blue or violet in daylight to violetish purple to strongly reddish purple in incandescent light.
Star Corundum
- The most valuable star corundum has a body color that provides a strong contrast to the star.
- Star ruby is typically the most valuable type of star corundum.
- Blue star sapphires generally cost less than star rubies of equivalent quality.
Sapphire Production
- Sri Lanka produces a wide range of fancy sapphire colors.
- Madagascar is a significant source of high-quality pink sapphire.
- Beryllium diffusion of sapphire can produce padparadscha colors, as well as highly saturated yellows and oranges.
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