Questionnaire 19

Front 1

Annealing irradiated diamonds can produce

Back 1

brown, orange, or yellow.

Front 2

Laser drill-holes

Back 2

become permanent clarity characteristics.

Front 3

Gemological laboratories, including GIA Laboratory,

Back 3

don’t grade fracture-filled diamonds.

Front 4

Most synthetic gem-quality diamonds are

Back 4

yellow or brown.

Front 5

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

Back 5

Yellow to greenish yellow under both longwave and shortwave.

Front 6

The origin of a diamond’s color

Back 6

should usually be determined by a gemological laboratory.

Front 7

Annealed diamond color can change if it’s exposed to

Back 7

heat during routine repairs.

Front 8

Synthetic diamond is a

Back 8

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

Front 9

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

Back 9

High-energy electrons in a linear accelerator

Front 10

The flash effect proves that a diamond

Back 10

is fracture-filled.

Front 11

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

Back 11

Metallic flux

Front 12

Color-treating diamonds in a linear accelerator produces

Back 12

blue or blue-green colors.

Front 13

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

Back 13

Etched or frosted naturals

Front 14

The use of synthetic diamonds in jewelry

Back 14

is limited by high production costs.

Front 15

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

Back 15

1950s