your single strand of Mikimoto pearls look beautiful and having the original box and the first-hand history of the pearls will add to their interest and value. I can personally supervise the appraisal for you on Antique Jewelry Investor. An appraisal certificate will help you to sell your pearls. Prospective buyers like to know what they are buying and a valuation is a stamp of authenticity.
Are you able to ship the item to a prospective buyer yourself? If you can ship this item either within the US or International contact me for further information. Please tick in the "selling" box.