" apis-Lazulí' is a blue coloured precious stone.It is mineral of the class "

Lapis-Lazuli' is a blue coloured precious stone. It is mineral of the class

Lapis-Lazuli' is a blue coloured precious stone. It is mineral of the class

The precious Ruby stone is :

Coloured gem stone is an example of……..

A blue colored mineral 'lapis lazuli' which is used as a semi-precious stone is a mineral of the following class :

The precious stone aquamarine is :