thanks for writing in. From the materials alone, you can tell, it 's a high quality piece. Some high quality jewelry is numbered, especially if part of a collection. For example, In more recent 20th century jewellery culture, each piece in The Mikimoto "MU" Collection (which represented the essence of Japanese Jewelry culture) was numbered and the design drawings are permanently stored. It might be worth getting an appraisal! If you choose an on-line jewelry appraisal - you will need to upload photos.
