Historia de las Piedras de Nacimiento o Natales, Piedras Zodiacales o de la Fortuna. Descubre cuál es la piedra de nacimiento de cada mes y cómo han evolucionado durante el transcurso de los tiempos.
Información sobre los Citrinos. Los citrinos son piedras preciosas ideales para usar en joyería. Su buena dureza, transparencia, brillo y su precio asequible ...
The legend of this rare gemstone says that the inhabitants of the Pamir Mountains were under the protection of the SUN. The sun helped them in their harsh life at the mountains, and illuminated them in the most difficult times...
¿Qué es una amolita? Valor de estas iridiscentes piedras preciosas. Descubre esta bella piedra preciosa Canadiense.
What is ammolite stone? Value of these iridescent gemstones. Discover this beautiful Canadian gemstone.
Thoughts alouds of a gemologist about gems scams, the relationship that we humans have with gems and jewels, and of course, about feelings.
I was a bunch of small completely scattered pieces; in some of these there was passion, in others, enthusiasm and in others...I don't even know what there was, and that is how I began to collect precious gemstones in a compulsive, impulsive way. Not knowing what they were, knowing nothing about them, because who goes around picking up shells from the sand, and falling in love with them without rhyme nor reason.
To understand why the fissures or the cracks in precious stones are filled, we first need to understand the effect that fissures have on gemstones.
But before this I am going to explain a very important concept to you about gemology: THE REFRACTIVE INDEX.
The refractive index (also called the index of refraction) of a gem concerns the relationship that exists between the speed of light in a vacuum (whose index is 1) and the speed of light through the gem. The denser the gem, the lower the speed of light in that medium and the higher its refractive index. Usually gems have a RI from 1.2 to 2.6.
But now let's get back to fissures; certain gems, such as emeralds, usually present quite a few inclusions, and inside these inclusions we find fissures and/or cracks that can break through to the surface, and then, what happens to light? This is when what we call reflexion takes place. Light meets two different mediums; in one it travels at one speed, and in the other at a different speed; and the difference is so large that it becomes very visible.
I’m sorry, but I had to say it. THEY DON'T EXIST. The same as semi-good friends or semi-tasty food doesn't exist. Imagine that your son/daughter comes home one day saying: “mum, dad… I semi-passed the exam”. What would you think?
From among all the weight units, the most commonly used is CARAT, a word that derives from the Arab word KIRAT, the weight of the carob tree seed, which was used as a measurement unit because the seeds’ weight was always the same.
The weight in carats of precious stones must not be confused with the number of karats as an expression of the GOLD GRADE (quality index that expresses the amount of fine gold that a certain jewellery piece contains).
24 karats = 100% // 18 karats - 75 %.
12 steps about how to buy loose gemstones online.