Emerald is one of the four major gemstones in the world.
The name comes from the ancient Greek word "smaragdus" meaning green.
The word "emerald" has been used to describe the color green since ancient times all over the world, and has become synonymous with the color green. In Japan, deep green is often referred to as "emerald green."
The most important thing about emeralds is the intensity of their color. The deeper the green color, the more valuable they are, and large, deeply colored emeralds are very expensive. 
( Custom-made small emerald half eternity ring )
As a mineral, it is a bluish green to green variety of the mineral beryl.
Emeralds often contain inclusions, and these inclusions and internal cracks are part of the emerald's charm and are called jardins.
Emeralds are a gemstone with a certain hardness, but because of this jardin they are vulnerable to large impacts and must be handled with care.
The meaning of emerald
Legends have it that the wearer of an emerald is endowed with the power to see the future, to reveal the truth, to protect against evil spells, and it has also been believed to have the power to heal illnesses.
It is also known as the gemstone that Cleopatra loved the most. She owned an emerald mine and is said to have not only worn emeralds but also used the powder as eye shadow. 
( Emerald ring, fresh green emerald )
May birthstone/wedding anniversary stone
There are several birthstone lists around the world, and emerald is listed as the birthstone for May on many of them.
It also represents undying love and is the gemstone chosen to mark the 20th and 35th wedding anniversaries (55th anniversaries in Japan). 
( Custom-made emerald jewel ring )
