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15 Cards in this Set
- Front
- Back
Annealing irradiated diamonds can produce |
brown, orange, or yellow.
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Laser drill-holes |
become permanent clarity characteristics.
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Gemological laboratories, including GIA Laboratory, |
don’t grade fracture-filled diamonds.
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Most synthetic gem-quality diamonds are |
yellow or brown.
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Which one of the following is typical of the UV fluorescence of synthetic diamonds? |
Yellow to greenish yellow under both longwave and shortwave.
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The origin of a diamond’s color |
should usually be determined by a gemological laboratory.
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Annealed diamond color can change if it’s exposed to |
heat during routine repairs.
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Synthetic diamond is a |
manmade material with essentially the same physical, chemical, and optical properties as natural diamond. |
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Which one of the following is used today to safely color-treat diamonds? A. X-rays B. High-energy electrons in a linear accelerator C. Radium compound D. Ultraviolet radiation |
High-energy electrons in a linear accelerator
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The flash effect proves that a diamond |
is fracture-filled.
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Which one of the following clarity characteristics might be found in a synthetic diamond? |
Metallic flux
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Color-treating diamonds in a linear accelerator produces |
blue or blue-green colors.
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Which one of the following is an indication of the HPHT process? |
Etched or frosted naturals
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The use of synthetic diamonds in jewelry |
is limited by high production costs.
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Scientists succeeded in producing synthetic industrial diamonds for the first time in the |
1950s |