Emeralds

Emerald is a gemstone and a variety of the mineral beryl

Sapphire

Sapphire is a precious gemstone, a variety of the mineral corundum,

Ruby

Ruby, a gemstone composed of transparent red corundum (q.v.), a mineral

Granite

Granite is a coarse-grained intrusive igneous rock composed mostly of quartz,

Marble

Marble is a metamorphic rock composed of recrystallized carbonate minerals, most

Sand Stone

Sandstone is a clastic sedimentary rock composed mainly of sand-sized silicate