Ruby
Ruby is a pink to blood-red coloured gemstone, a variety of the mineral corundum (aluminium oxide). Other varieties of gem-quality corundum are called sapphires. Ruby has a hardness of 9 on the Mohs scale and is considered on of the rarest and most valuable gemstones.
Zoisite
Zoesite Ca2Al3[Si2O7][SiO4]O(OH) also known as Saualpite, belongs to the Epidote group of minerals. It has a hardness of 6-7 on the Mohs Scale
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