You can choose a stone based on many factors. Some factors can be color, shape, weight, purity, etc.

1 -Your colour

Colour is one of the most important aspects of gems, so this often results in the choice of a gemstone.

Some Burmese rubies are described as: "Dove Blood," this exceptional red colour is very precise in the eye of the specialist but has nothing to do with the colour of the animal's blood. It is for all precious stones, the colour is paramount and can define certain provenances: for Star Sapphire: Kashmir blue, Burma blue, Ceylan blue.

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For diamonds, the colors must be frank: white, the purest or else well-differentiated tinctures: yellow, pink, red, blue, Black Onyx, cognac.

2 -Your weight and shape

The weight of a Pink Tourmaline, estimated in carats (1 carat = 0.2 grams), determines its dimensions, and acts exponentially on its price: at the same quality, the 2-carat stone is more expensive than two 1-carat stones. This rule is further verified with rare stones.

For the same weight, a Star Ruby stone could have been carved in different shapes: shiny, oval, pear, emerald, cushion.

3 -Its purity

The purity that determines transparency in a gem is highly sought after.

Carved stones that do not involve any inclusion see their value greatly increased. In any case, inclusions are not always cursed. In some stones, these participate in their aesthetics, together with their colours, take them to the rank of being the most beautiful Padparadscha Sapphire in the world. The lab created emerald of Colombia and, more especially those from the Muzomine include inclusions known as the emerald garden that adds to the aesthetics of the gem.

4 -Your cut (it is understood as cut the shape given by the carver or the diamond maker).

The carver cuts the Green Sapphire stones, or the diamond to the diamonds should be as perfect as possible to give the stone its best lustre and fires.

The perfection and the shape of the cut influence the price of the Green Agate stone. Thus, a brilliant-cut diamond will have, for the same weight, a higher price than a fantasy cut diamond.

The facets must be regular in their geometry and well polished, the bedroom must be well balanced, neither very important nor too small. For polychrome stones such as Paraiba Tourmaline, the cut must be made on the right axes of the glass so that the colour seen by the base is as pleasant as possible.

5 -For the place of purchase and the price

It is important to buy a gemstone with the greatest confidence and to a recognized specialist who will advise you. Never buy a valuable Black Spinel in a second-class store on the other side of the world, in a producing country; you have all the possibilities to pay it more expensive than its real value!

For the purchase of Rhodolite Garnet, do not hesitate to pay the certificate of an approved laboratory and do not accept, above all, the certificate of a local seller or a so-called unknown specialist who does not give you any guarantee.

Conclusion: These purchase criteria are all very important but are rarely met and in a small number of cases that are exceptional stones, of a great rarity.

Article Source : www.authorea.com/433496/JD3JTtAzVV8FaU35bdAYeA