Mikimoto 16" Necklace

My grandmother visited Lane Crawford in Hong Kong back in the early 70s and bought me a 16", individually knotted strand of Mikimoto pearls in a "Mikimoto Lane Crawford" case. They do have the signature clasp (silver) and the not-quite-white, pink-ish cast to them. It looks like they are about 5.5-6 mm....perfectly matched as best I can tell.

Now the question: I am going to give these pearls to my daughter and I would like to impress upon her how special these are. A-s-s-u-m-i-n-g this is an authentic Mikimoto necklace, what is likely to be the ballpark estimate of their value?

Again, this is just for her edification. Thank you. KMM