Complex sentence: Due to the deep green color of the gem, they are sometimes referred to as Siberian emeralds, though they are on a mineralogical level completely unrelated, emerald being a precious stone and diopside being a semi-precious stone.
Split into simpler sentences: Due to the deep green nature of the gem they are sometimes referred to as Siberian emeralds, though they are on a mineralogical level completely unrelated. Emerald being a precious stone and diopside being a semi-precious stone.