From the estate of Paul Wachtler-This is a very rare perfect dark blue about 50 karats in size aquamarine set in white gold with diamonds-Mr Wachtler was a high level executive for the GM company and headed up International Development-He traveled often and aquired many interesting items. This piece was purchased in the 1950s in Brazil.I have original correspondence from the jeweler dated 1953 describing many items purchased including this one-" By jeweler Very Finest Aquamarine-Real Blue-Perfect-about 50K-900 c. per K" Had private offer many years ago for 50,000-Excellent condition