The most rare minerals of the planet with unique characteristics from CABRHA diamonds


The word diamond originates from the Greek word adamas - invincible. Diamond is the hardest mineral of this planet. It achieves the highest, ie. 10th degree of hardness on the Mohs scale, which measures the hardness of minerals. At the degree 9, there is to be found the group of corundum (eg. rubies, sapphires). Although there is only a difference of one degree, the diamond is in fact 140 times harder than corundum. This qualitative difference is the same as the difference between 1st and 9th degree.


Diamond has a density of 3.51 g/cm3. Thanks to this the diamonds deposited in river beds and formed the so-called alluvial (driftage) repositories. Therefore this specific weight there is the basic criterion for determining the genuineness of diamonds

Thermal Conductivity

Diamonds have 6 times higher thermal conductivity than copper. This property is used when testing diamonds as well as by using diamonds in nanotechnologies..

Translucency And Transparency

According to transparency we distinguish the diamonds from absolutely pellucid ones up to completely opaque ones. Into the jewels there are set the utmost fine stones. The other diamonds are used in the industry, where they play their unsubstitutable role.


This feature of diamonds was first used in the sixties of the 20th century by sorting of diamonds. Each diamond irradiated by X-ray fluorescences and can thus be separated from the rest of the rock. The fluorescence of the diamonds is usually blue, but it can be also white, purple, yellow, green or orange.

Refractive Index

It reaches by the diamonds a specific value of 2.417 and gives the diamond its unique optical phenomena, which is also used to determine the authenticity.


Dispersion is an optical feature expressing the dependence of the refractive index on wavelength (ie. colour) of the entering light. Colour effects which are observable in the rising rays of light there are caused just by this property. Diamond has a low dispersion of -0.044. Most synthetic stones with a similar refractive index have higher dispersion and the play of colours in these stones is unnaturally striking.

Game Of Light  – Scintillation Brilliance

Scintillation brilliance, it means the number of reflections by the polished stone movement or by the source of light movement. The amount of light reflections depends on the number of facets and on their correct size.


The white light around us is in fact composed of a wide range of colours from red to purple. Depending on what range there is absorbed or emitted, the final colour is produced. Almost all the diamonds contain atoms of other elements, too. Most often there are nitrogen atoms that cause the yellow colour (ie. absorbs the blue spectrum). Boron causes the blue colour (it absorbs the yellow spectrum). Other colour mutations are caused by other mechanisms such as deformation of the crystal lattice - pink diamonds, or radiation - green diamonds etc. The diamond without admixture of other elements is completely colourless.