Black Eye Agate 4mm Round - 15-16 Inch Eagle and variation of the amount

and variation of the amount of iron in the stone creates a color range from reddish purple to deep violet to light lilac

” which means to deceive

The stone's composition remains somewhat ambiguous

a green-colored mineral

second only to Diamond

Black Eye Agate 4mm Round - 15-16 Inch Eagle and variation of the amountBlack Eye Agate is a variety of Sardonyx which has a Sard base, typically of brown or black, with bands of white Onyx running through it. Sard is not Onyx, but rather a dark variety of Carnelian. Sardonyx is sometimes treated to bring out its reddish tones. It is believed by some to improve memory and increase analytical skills.