It was during the 1860 s that the reverse crystal intaglio became a popular jewelry form. The technique required that the design was cut into the back of a cabochon crystal. The design was then reverse painted and backed with a piece of mother-of-pearl. This made it appear that the animal's head floated inside the crystal. The racehorse design graced cuff links as well as stick pins and here we see a perfect example. The stick pin measures one half inch in diameter and is mounted on 18K gold. The 18K stick pin is 3 ½ inches long. The condition is excellent. Specimens such as this are fetching very high prices today because of the renewed interest in this unique art form.