Hi there - a photo will Help if you want to sell the pearls. The japanese jeweller, Honorable Kokichi Mikimoto devoted his life to one ambition, he was quoted as saying - 'I would like to adorn the necks of all the women of the world with pearls' and judging from the amount of cultured pearl necklace submissions and enquiries we receive, I think Mikimoto succeeded in his lifetime ambition of doing just that.
In other words, if I was collecting Mikimoto cultured pearl examples from 1930s - i would look for a statement piece - I would steer towards his perfectly spherical cultured pearls which during the 30s had achieved global recognition. (if the pearls are Japanese Akoyas).