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The Ruby

by Julie MIALET 30 Jan 2020

The Red Stone From Burma

Ruby is one of the most precious gems. Often small in size, stones over 4 carats are very expensive.

It belongs to the corundum family (same as sapphires). Its red color is due to the presence of chromium. Known since Antiquity, it has long been used to treat all kind of pains. It was thought to have these virtues because of its blood-like color.

Chaumet necklace, Dior ring

It has been confused with spinel or garnet, which can be found in the same mines.

With a hardness of 9 on the Mohs scale, the ruby ​​can be set in a ring, bracelet, necklace or earrings.

Collier et Bracelet Camélia, Rubis, Diamants et Or Gris, Chanel

Camélia necklace and bracelet, Rubies, Diamonds and Gold, Chanel

Like emeralds, rubies are generally included stones. These are not flaws, however the purer a stone, the more valuable it will be.
Color is the most important criterion when appraising a ruby. Quite dark and deep reds are highly sought after, unlike light or milky colors.

Ruby Ring, Diamonds, Or Gris 

The first synthesis (stone created entirely in a laboratory) of a ruby was created in 1902 by August Verneuil. As with sapphires, this fusion method is recognizable by curved growth zones. These zones exist in natural stone, but they are straight.

These synthetic stones are widely used in watchmaking.

Watch mecanism


For centuries, rubies came from Burma. The most beautiful, called “pigeon blood” were extracted mines in the Mogok valley. Of magmatic or metamorphic origin, we also find rubies in Thailand, Mozambique, Tanzania or Kenya.

Today, African rubies, particularly those from Mozambique and Tanzania, are in vogue, as their prices are more attractive and they represent a good investment.
To find out more, see our article "Burmese or African rubies".

Mogok Valley

Ruby is july's birthstone. In France, a ruby wedding is attained at 35 years of marriage.


If you are interested in rubies, don’t hesitate to discover what les Pierres de Julie have to offer in the store…

We are also available for any free expertise of your ruby jewelry, for that you can send an email with your photos to

Whether you're interested in buying a piece of jewellery or a stone, a free jewelry appraisal or jewelry resale, Pierres de Julie welcomes you to its Parisian boutique in the Village Suisse, a stone's throw from the Ecole Militaire and the Esplanade des Invalides.

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