Natural Agate Gemstone: Agate known as a Good Luck stone. It Brings Peace and Happiness. Agate is a Protective stone. Its protective energies are more gentle and subtle than some stones. It has traditionally been used to make knife-edge bearings for laboratory balances and precision pendulums, and sometimes to make mortars and pestles to crush and mix chemicals. Purchase Antique Accent Agate Knife | Hand Made Agate Stone Knife from Natural Agate.