I have no idea what a stamp for copper looks like. I have no idea what to look for...I am only going by the information given to me when I purchased it...hope this helps.
Is the stone of meditation and spiritual transformation. This stone works on the upper Chakra. It assists in allowing trust with your own intuition and opens the spiritual flood gates to a realm of endless possibilities. It gives us the space to "be" our spiritual selves and clears the mind for extraordinary vision and insight. Agate is composed of microscopic crystals of Quartz laid down in colorful bands or ribbons. The appearance of agate is waxy and soft. Almost always translucent and occasionally transparent. Agates are grounding stones. They help obtain a better physical/emotional balance. They work to raise consciousness. Builds self-confidence. This is a very soothing stone. It calms nerves and brings peace to the wearer.