The dendritic opal is a whitish-grey or colorless chalcedony. Though it is called to be a type of opal, the common opal is a silica that has no uniform structure, rather than an agate/chalcedony. This beautiful stone is therefore not a real opal. It can be observed the lack of color flashing. It is actually an agate.
Dendrites are multi-branching tree- or fern-like inclusions of iron, manganese or other oxides that create patterns within the gem.
Dendritic opal is typically cut in slices to best exhibit nature’s marvelous artwork.
Like other types of chalcedony, dendritic opal, or let’s call it on its real name, dendritic agate, has a hardness of 6.5 to 7 on the Mohs scale.
Carl Faberge, the famous jeweler (commissioned by the Russian Imperial Court) often used dendritic opal with other precious stones in his pieces. In Russia, the stone is known to be the stone of longevity, good health and prosperity, the Stone of plentitudes.