This Is Such A Beautiful Piece! I Believed It Was Sardonyx Because Of The White Banding, But Maybe It’s Just Carnelian Agate. Either Way, It Is Just Gorgeous! It Can Be Worn As A Pendant, A Slider Pendant On A Ribbon Or Wide Chain Or As A Brooch. I Paired It With This Pretty Gold Tone, Vintage Chain, And I Think They Look Great Together. Gold Tone Metal On Pendant Shows Minor Wear. 1.75” X 1.5”. Chain Is 21” Please See Photos Of The Gorgeous Stone!