Blue Agate Jewelry Blue Agate is a geode type of agate which ranges in color from light blue to a bright cornflower blue to a deep blue-violet. Blue agate, like Blue Lace Agate is a calming stone and has similiar healing powers for the throat. It also calms the mind which assists in meditation. It release worries and fears and creates a feeling of relief. Blue Agate can also be used to heal skin irritations and infections such as eczema, psoriasis, dermatitis.