Antique diamond tourbillon ring

Tourbillon ring circa 1900 - 1910. 

Ring set with a center old European cut diamond of approximately 0.95 Carats ( Estimated I color - Si clarity) and 7 small old mine diamonds for a total of approximately 0.50 Carats. 

Yellow gold 18 Karat and platinum. 

The ring is stamped with "18"

A certificate of authenticity is delivered with the ring.