There are many classifications of gem stones and minerals, because
there too many different opinions on what is what. The definition of
a "precious stone" is not objective. It often depends on fashion,
demand and portability (note, that demand could depend on anything
including the magic qualities of the gem). After reading this article
you will be able to get your own opinion on the subject.
English mineralogist of the beginning of the 20th century G.Smith
stated, that there were 3 the most important qualities of the gem
stone: beauty, durability and rarity. Only diamond, ruby, emerald,
blue sapphire, pearl, opal and alexandrite could be called the
precious stones in that case. Some countries classify other
transparent gems that usually have faceted cut as semi-precious as
they do not have all 3 qualities at the same time. Other countries
use the term "gem" regardless, because stones that were called "semi-
precious" before are sold for more than a fine diamond now.
You probably have your favourite piece of jewellery with a gem. Take
it and look at it. Let's see together what makes this gem so
attractive?
First of all we notice its color. The magic powers thought to depend
on the gems' colors. The color makes the gem attractive, but... is it
what we see? All people have their own color perception. It is not
easy to describe the exact tint. The light can change our color
perception too.
What time of day do you wear your gem? Most people prefer wearing
them in the evening. Do you know how electric light affects your
perception of the gems? Dark red, blue and purple stones loose their
beauty. Orange, yellow and yellow-green stones look better. Day light
is the best when you need to see the real colors and gem's qualities.
Now, we are moving to the "qualities". Many stones have flaws and
defects either natural or manufacturing. Natural flaws are cracks and
inclusions that often are other crystals, minerals, gases or liquids.
They do reduce the price of a gem, but do not devaluate. It is
extremely difficult to find a coloured precious gem stone with no
flaws (if your last name is not Rockefeller). The flaws can add an
interesting look to a gem and tell of its place of origin. There is a
very good chance that a gem with no flaws is an imitation.
Manufacturing flaws are different. It could be wrong proportions of a
cut, external fractures, poor polishing. All these flaws devaluate
the gems. Be picky when you are choosing your gem, do not let the
stones that have any of this flaws into your collection.
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