Value of two strands of Pearls

My Mother passed away and I have her pearl necklaces that I am trying to get a value for. One strand is black pearls that were purchased by my Dad at Murata Pearl at least 10 years ago. The other strand are white pearls that my Dad gave to my Mother on their annivesary before I was born and I am 57 years old. I am not sure who to speak to in regards to their value because nobody seems to know anything about pearls. I have attached a couple of photos. Both necklaces are in excellent condition with no signs of wear or tear. Thank you.