Antique Mikimoto Pearls - Identification

[EmilyBennett]

Hi everyone! My father's great aunt left these pearls to me for when I turned 25 and I was wondering if I could have some help with identification and valuation for insurance purposes? They are so special to me and I'd like to know what I have here. She was a huge collector of jewellery and this is only one of a selection of Mikimoto products in her collection. Thanks so much in advance!