Edison Pearls. Inside of each of the oysters, there is a large beautiful Edison Pearl. Edison Pearls are known for their large size because they are cultured for much longer than Akoya Pearls. These Edison Pearls are cultured for 5 years. This extended cultivation period allows them to develop an extraordinary size and deep, radiant luster that sets them apart. Each pearl is a testament to nature's artistry and timeless elegance. IMPORTANT. These pearls will not fit in normal pendants. They will only fit in pendants that are listed with the title 14MM in their description, which are designed specifically to house the larger Edison Pearls.