Can someone please give me info on this jewelry, says Constantine 18K, thank you.

[Stephenj]

 

[VRBeauty]

In all likelihood those are custom, one-of-a-kind pieces. Unfortunately if there are no other marks it will be very hard to trace these pieces back to a specific jeweler or manufacturer. A name like "Constantine" of course makes one think of Greece, and Greece does not have a standardized system for marking and assuring metal purity metal purity... but then again, neither does the U.S. A quick internet search didn't yield anything promising.

I did find this: http://constantinecreations.com/, but the website indicates a 1986 start date, and I'd peg your pieces as having been made 60's-70's - but of course I could easily be wrong. might be worth checking out. Also this looks like it might have come from the same bench: https://www.pinterest.com/pin/139470919686198026/. The key was to include the word "freeform" in the search. Good luck!