Gemology World Quiz

Spring 2009 Edition

Test your knowledge about gemstones. Browse the Electronic Gemstone Library and the Gemstone Inclusion Library of GEMMOLOGY WORLD for assistance in finding the correct answers. All participants who submit their answers below will receive e-mail with their mark and the correct answers. The next quiz will be on-line June 21.

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1.Synthetic Moissanite - the new diamond simulant can easily detected by its

refractive index
high dispersion
double refraction
characteristic absorption spectrum

2.Lapis Lazuli - a blue opaque gem material comes mainly from

India
Madagascar
Afghanistan
Pakistan

3.The Black Prince's Ruby in the Crown Jewels is actually a

Garnet
Ruby
Spinel
None of the above

4.Alexandrite is a rare and valuable gemstone which shows

strong pleo-chroism
a colour change from red to green
spectral lines in the blue
weak fluorescence

5.Red beryl - sometimes incorrectly called red emerald

is mainly found in Pakistan
occurs only in Utah
is found in Africa
has recently been discovered in Brazil

6.What gem type does Indicolite belong to?

Garnet
Spinel
Corundum
Tourmaline

7. Which gemstone is strongly pleo-chroic?

Tourmaline
Tsavorite
Iolite
Spinel

8."Lavender Jade" is

the best quality jadeite
heat-treated jadeite
a mauve coloured variety of jadeite
actually nephrite

9.Which of the following gemstone has been confused with spinel but is actually double-refractive

Sapphirine
Andalusite
Brazilianite
Taafeite

10.The colour of Citrine is usually

yellow
pink
blue
green

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