Akoya pearls are the classic saltwater pearl: bead-nucleated, famously round, and famously mirror-bright. Freshwater pearls are grown in mussels, usually without a bead, which changes almost everything about how they look and what they cost.
Nacre
An Akoya pearl is a shell bead wrapped in roughly 0.4mm of nacre. A freshwater pearl is nacre nearly all the way through. That means freshwater pearls tolerate wear, polishing and time far better; Akoya can eventually show the bead if the nacre is thin.
Luster
This is where Akoya still wins. A top Akoya has a hard, metallic reflection that top freshwater pearls approach but rarely match. Mid-grade freshwater pearls, however, comfortably beat mid-grade Akoya.
Shape and color
Akoya is round, white, and consistent. Freshwater gives you rounds, drops, coins, keshi and baroques in white, pink, peach, lavender and treated colors — a much wider design vocabulary.
Price
A quality Akoya strand typically starts several times higher than a comparable freshwater strand. For most people buying jewelry to actually wear, freshwater delivers the better value by a wide margin.
Which to choose
Buy Akoya if you want one perfectly matched, formal, round white strand and the budget is not the constraint. Buy freshwater if you want real pearls you will wear weekly, in more than one color, without worrying about them.
