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To be simply taken into account a gem, a mineral, a collection of minerals, a natural stoneor other materials should fulfill the adhering to criteria refugee rates.
BEAUTIFUL

Beauty is the first standard of the gem as well as choose the attraction as well as its value.
This standard is simply specified by:
Color:
Colors as fresh and as strong as the beautiful stone, the higher its value. Ruby, sapphire, emerald, jade is simply the colored gemstones most attractive.

Transparency:
In general the more valuable throughout the more significant value.

Light (reflective mode):
Gemstones are simply reflective of the higher, the more attractive people. Diamond, zincon are examples of high light gems.

The special optical effects:
There are simply no gems attractive colors, no light and no transparency, however the optical effect is extremely special, alluring tastes of people. For instance, opal effect "game a little light" (play-of-color). The frequent optical effects in gemstones is iridescent phenomenon (in opal), the phenomenon of stars, cat's eye (in ruby, saphir, chrysoberyl..)

Currently a gem is simply not sustainable in the process utilized to combat the effects of diverse additional (shock, heat range, chemical ...). This standard is mirrored in:
- Hardness (mechanical strength)
Gemstone hard as the more mechanically durable, less probably to be shattered, chipped or scratched. Typically gemstones have a hardness of 7 or more (according to the relativescale of hardness Mohs level 10). The rationale for such a major component of airborne dust is quartz fragmentshardness 7, if the lengthy days can easily accomplish dishes or scratch your stone
Yet there are also exceptions, such as pearl, opal ..., small hardness (4-5), butis still well-liked because individuals are simply extremely pleasant
- Period
Some gems might possibly get large hardness, however not really very lengthy due to the specialstructure. A normal instance is the jewel jat (jadeit as well as nephrit) is simply extremely well-liked in Vietnam and additional Asian countries. Both minerals have a hardness 6 to 6.5, yet is very constant since of fiberbundle structure.

- Sustainable chemically
In addition to sustained mechanical gem needs to be able to endure the impact of chemicals (particularly acids) is common. Besides treasurable stones are simply additionally subject to the effects of temperature, specifically high-temperature
- RARE
This criterion depends on the notion of human subjectivity: what have actually youmust be simply unusual. Previously upon a time, Amethyst (purple quartz) is very well-liked and greatly valuedbecause it is simply very rare (20th century). Yet in the very early 20th century, when the Amethyst mines are simply discovered in manyparts of the globe (Russia, Brazil), its value is simply diminished down and so a long way has actually not altered
Adhering to three criteria are of decisive significance for the value of gemstones. Also, the value of precious stones are governed by way of the pursuing criteria
- TASTE
Each individual, each people, each geographical region - historical-cultural, each historical duration can easily not taste the same in certain kinds of valuable pure stones. Jade jat from past to present is in particular popular in the East, while in Europe as well as America, customers are simply less interested in this type of pearl. In the northern origin at the sun is typically preferred type of light ruby red, rubyand pink quite than red as in the Middle East is simply sunny. Over time the taste for some gems transform significantly. Opal ancient Roman times higher value than immediately since the Romans believed that opal has the capability to safeguard individuals, specifically in battle. In the early 19th century was simply born the novel "Anna Geierstein" by way of Walter Scott in which the misery as well as tragedy of the protagonists are associated by having opal. Novel that one read and translated into many languages. So to keep the 19th century opal company in the U.S. almost over, and so a long way, for countless Americans very owning no opal is simply not really acceptable
- PERFECT LEVEL
The spotless outside and especially inside the enclosure (recognized collectively as the disabled), will alter the value of the pure stone was manipulated. Locating and understanding the exact site of these defects is simply an important partof Pearl Investigation Study. The consequence of the defects to the value of different kinds of valuable stones isnot the same. There are simply many can certainly not be simply agreeable for an entirely current diamond might be simply present in the emerald, as in emerald just about constantly get diversified disabilitiesand we still get very high economic value
- SIZE
The pure stone size develops into larger, greater value. Having said that, the relationship between size and value of treasurable pure stones is not aproportional relationship.

PROCESSING AND EXCELLENCE
Gemstone only real value after being processed (the pearl), qualityprocessing greater value
Gemstone only legitimate value after bing simply processed (the pearl). The more significant the quality of processing, the value of bigger pure stones. The superiority of a manufactured stone is specified by the parameters:
- Shape
- The balance
- The perfect (symmetric mode, gloss)
PRICE STABILITY
Although the cost of gems is simply regularly a convinced range, but generally they tend to be comparatively constant for a long occasion, merely that encourage brand-new investment in the field of treasurable pure stones.