www.925-1000.com

It appears your ring is marked "TD", which is likely the maker's mark, not a hallmark. Hallmarks designate metal purity and country/city of origin generally, trademarks are to identify the maker. I do not know who the maker is.

Hello, I am an estate Jewelry dealer in California, I specialize in natural pearls and from the look of the photograph, these are most likely cultured pearls. For verification you can send them to a local gem lab for certification. If you're in USA I recommend EGL as they have the best rates and ...

The anchor in this case is part of the trademark (company), the hallmark would be the "10k", if the piece were english it would have an anchor mark in a cartouche and would likely be 9k, not 10k.