My account : Sign in

My orders

Your cart is empty.

How do you choose a gemstone?

Discover how to choose a precious stone.

1 - The Color

Color is one of the most important characteristics of a gemstone; it is also quite often the criterion for choosing a precious stone.

Certain rubies from Burma are called “pigeon blood”, referring to the precise exceptional red color, recognized by the educated eye of a specialist, yet have nothing to do with the actual color of the animal’s blood. In Burma, the less desirable color is called “Crying Indian" quality, in the local dialect, referring to the fact that Indians buy all types of qualities of gemstones, especially the lowest. Between these two types, the price per carat can range from $1 to $100 000 or more.

This is true for all gemstones. Color is paramount and can sometimes be used to define their origin: as with the sapphire; blue Kashmir, blue Burmese, or blue Ceylon…

For the diamond, colors must be clear: for the white diamond, they must be the purest white; as with tints, their color profoundly distinct: yellow, pink, blue, cognac.

2 - The Weight and Shape

The weight of a stone, estimated in carats (1 carat = 0.2 grams), determines its size, and acts exponentially to determine its price; with equal quality, a 2 carat stone, is worth more than two 1 carat stones. There is even more truth to this equation with rare stones.

As for the shape, with the same weight, a precious stone can be cut into different shapes: brilliant cut, oval, pear, emerald, cushion, etc...

3 -The clarity

The purity determines the transparency, or clarity, and is highly sought after in gemstones.

Carved stones with no inclusions greatly increase their value. In all cases, if there are inclusions, they should not be unsightly; they should not be situated at the level of the ‘table’ (the largest facet on the top of the stone), or on any visible part of the gem after the stone is set.

However, precious stones with inclusions are not always ill-fated. With certain stones, they contribute to their aesthetics; the milky turbulences in the sapphires from Kashmir are famous for contributing a gentle sweetness to their color, and lead them into the rank of the most beautiful sapphires in the world; the emeralds of Columbia, most especially those from the Muzo Mines have inclusions, which experts call "the garden of the emerald”, as they ultimately enrich the beauty of the stone.

4 - The Cut (meaning how the facets are cut by the lapidary or a diamond cutter).

The cut realized by a lapidary, for colored gemstones, or a diamond cutter, for diamonds, must be performed in perfect symmetry and proportion in order to give the best brilliance and fire to a gemstone.

The perfection and the form of the cut also influence the price of a stone. Thus one brilliant cut diamond will have a higher price for the same weight, than that of a fancy cut diamond.

Facets must be regular in their geometry, and well-polished in their totality; the ‘pavillion’ (The lower part on the bottom of the stone, invisible when mounted) must be well balanced, not too deep, and not too shallow. The stone must always be cut in the right areas of the raw crystal so that the color is evenly distributed.

For polychromatic stones like Tanzanite, the cut must be executed precisely in right areas of the crystal axes so that the color of the ‘table’ (stones top main facet) is as pleasant to the eye as possible.

5 - The Place of Purchase and Price

It is important to buy a gemstone in full confidence from a well-known, recognized specialist who will advise you, and in a premise that gives you security with real warranty.

Never buy a valuable stone from a booth or stall at the other end of the world, far from its country of production; you are likely to pay more than its real value!

To purchase a stone of value, do not hesitate to pay for a certificate from an accredited laboratory; but above all, never accept when a local dealer, or so-called unknown specialist, does not even offer a warranty.

These criteria of selection are all very important; but if they do not always meet these categories in their entirety, one must be aware, there are only an infinite percentage of cases of gemstones that are actually exceptional; a great rarity at best.

Thus one must not condemn these precious gems, that sometimes slightly deviate from these criteria, they can also be very beautiful, and quite valuable.

Remember that first and foremost, buying a precious stone, is a journey of the heart, a personal adventure; a sort of bond created between you and the mineral. If this occurs and you have the means, buy the stone that you have touched!
My experience has shown me on numerous occasions; that when you allow this moment to pass, a stone, for a variety of reasons, can cause you eternal regret because you will never rediscover one, which is the same, a second time. Buy the stone that you have touched immediately!