These are beautiful metal stands with the wings of the dragon being a stone/rock/gemstone material. This piece is a Mexican Lace Agate wing. Each wing is approx. 6" long by 2" wide and total wing span when together at the widest point is about 11.50". 
 
Mexican Lace Agate is a banded chalcedony variety. Like many agates, it’s found primarily in limestone. The nodules vary widely in color, but they generally have a few common patterns.