Any help is greatly appreciated in identifying the designer of a cuff bracelet & ring set I have. They are crafted from sterling silver & both have a large yellow gold sphere tension set at the center. The spheres tested as 14K gold with jeweler's acid but there are no marks indicating gold content. Both pieces are marked "STER" with a copyright symbol. I would assume these are American but can't be too sure. The signature appears to be several conjoined letters in an abstract design. Thank you for any information in advance!
Ring:
Ring Mark:
Cuff Bracelet:
Cuff Mark:
