how exciting! It's great news you have a certificate of authentication and also, the pearls being in a red velvet pouch for all these years, indicates they are still in good condition.
Mikimoto first opened a pearl accessory store in Tokyo's Ginza district and exhibited his pearls at the World Exhibition in Paris in 1937.
I have arranged with a wonderful panel of jewelry professionals to provide jewelry appraisals on-line thru Antique Jewelry Investor. Tracy, The Appraisal Form Can be Found Here. It is an easy and straightforward process.