69ST479-SR: Red Sardonyx S Curve Rectangle 17x30mm - - 1 Piece Pinit $1.65 Quantity discounts available QuantityPrice1 – 1$1.652 +$1.45 SKU: 69ST479-SR Quantity -+ Add to Cart Details Sardonyx is the same stone as Onyx, a banded agate with regular and uniform stripes. Onyx has a black base, sardonyx has a brown base. Like most agate... Material Red Sardonyx DetailsMaterialBackSardonyx is the same stone as Onyx, a banded agate with regular and uniform stripes. Onyx has a black base, sardonyx has a brown base. Like most agates, sardonyx and onyx are often dyed for color enhancement and uniformity.BackRed Sardonyx