CS21

अब Quizwiz के साथ अपने होमवर्क और परीक्षाओं को एस करें!

The most-prized chatoyant gem in the world is

Cats eye chrysoberyl

When Alexandrite was discovered

1830

When was tanzanite first discovered?

1967

When did TanzaniteOne buy AFGEM and its assets?

2004

Tanzanite ranks what on the Mohs scale?

6 to 7

Iolite and andalusite rank what on the Mohs scale?

7 to 7.5

Alexandrite ranks what on the Mohs scale?

8.5

About what percent of tanzanite is heat treated?

95

What stone is the finest color change gem and the standard for which all other color change gems are judged

Alexandrite

Which gem was named after a Russian czar?

Alexandrite

In iolite, the most valuable main face-up color is

Blue

What color is top-quality alexandrite in daylight?

Blueish green

Cutting tanzanite to emphasize which color usually wastes less of the rough?

Bluish Purple

Untreated tanzanite is typically

Brownish

The color change in alexandrite is caused by

Chromium

What was the old Victorian name for yellow Chrysoberl?

Chrysolite

What are the pleochroic colors for violet iolite?

Light violet, dark violet, and yellow-brown

What are the pleochroic colors for bluish iolite?

Colorless to yellow, blue-gray, and dark violet

What is an old Greek word for cat's-eye chrysoberyl that means ""wavelike form""?

Cymophane

When was alexandrite found in Brazil?

Early 1980s

What makes chrysoberyl the most prized chatoyant gem?

Excellent hardness and durability combined with the sharpest cats eye

What are the pleochroic colors of alexandrite?

Green, orange, and purple-red

Almost all tanzanite is

Heat Treated

What changes during alexandrite's color-change effect?

Hue

What is the trade name for gem quality cordierite?

Iolite

What causes iolite's violetish blue to violet color?

Iron

Where was tanzanite discovered?

Merelani

What is a major source of Iolite, cat's-eye chrysoberyl, and alexandrite?

Sri Lanka

What is the most convincing tanzanite imitation to date?

Synthetic forsterite

Which of the following gems is the most economically important?

Tanzanite

A translucent to opaque pink zoisite, often streaked or mottled with gray or white, is called

Thulite

The name tanzanite was given to transparent blue zoisite by

Tiffany and co

Top-color iolite is

Untreated

Where was alexandrite first discovered?

Ural Mountains in Russia

""Mint chrysoberly"" is colored by

Vanadium

What causes the Cat's eye in chrysoberyl?

light reflecting from needle like inclusions in the gemstones

Tanavyte is a trade name for

purple synthetic YAG

Tanzanite's best color is

strongly saturated blue or violetish blue


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