FEATURES Gems are characterized in terms of refractive index, dispersion, specific gravity, hardness, cleavage, fracture and luster . They may exhibit pleochroism or double refraction. They may have luminescence and a distinctive absorption spectrum. Material or flaws within a stone may be present as inclusions. Like other forms of alternative therapy, crystals work by channelizing your energy levels , thereby, focus on healing your body from the inside. Crystals also carry the power to induce …