Found via a Google Images search - link attached.

The Germans were quite expert at dyeing (or staining, if you prefer) chalcedony blue, and the precise geometric cutting seems very Idar-Oberstein as well.

Unlike the filigree silverwork on the Boshan-style necklace, the silverwork on the "Sycee" clasps seems to be more European in technique.

And why the English transliteration "Sycee" - silver items made by Chinese for Chinese clients would more likely feature Chinese characters, yes?

Hmmmm.....