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15 Cards in this Set

  • Front
  • Back

Annealing irradiated diamonds can produce

brown, orange, or yellow.

Laser drill-holes

become permanent clarity characteristics.

Gemological laboratories, including GIA Laboratory,

don’t grade fracture-filled diamonds.

Most synthetic gem-quality diamonds are

yellow or brown.

Which one of the following is typical of the UV fluorescence of synthetic diamonds?

Yellow to greenish yellow under both longwave and shortwave.

The origin of a diamond’s color

should usually be determined by a gemological laboratory.

Annealed diamond color can change if it’s exposed to

heat during routine repairs.

Synthetic diamond is a

manmade material with essentially the same physical, chemical, and optical properties as natural diamond.

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

The flash effect proves that a diamond

is fracture-filled.

Which one of the following clarity characteristics might be found in a synthetic diamond?

Metallic flux

Color-treating diamonds in a linear accelerator produces

blue or blue-green colors.

Which one of the following is an indication of the HPHT process?

Etched or frosted naturals

The use of synthetic diamonds in jewelry

is limited by high production costs.

Scientists succeeded in producing synthetic industrial diamonds for the first time in the