I would think one could go to China, lease some freshwater growers, supply them with the nuclei and grow them as they did the Buddhas. I have seen that Mickey Mouse one for years, but maybe they never got permission to use his image. A contract from Disney would put them on the map, if they could mass-supply the little icons.
It seems to be marketed as a corporate image gimmick, a party favor idea, that hasn't sold to corporations. I doubt Batman is licensed either! But the yin yang is kind of cool. This idea could make a mass jewelry market one way or another. It is a business far from trying to produce rare or unique pieces. More likely it is lowly beader stuff, mass production stuff. I have just never seen any sales from them, yet. Maybe it is a business in mind only?