Boesemani only came in from one source in 2008ish in Germany .
It's not a ray you'll likely see one day unless somebody breeds them and sells pups or somebody finds a source in Suriname and would have to order alot to make it even worth it. I predict next time they are offered from exporter their will have to be a big order done for them ,which is good because the price won't be too bad but they won't be as rare.
You can't compare them to pearls . Pearls come from an area of brazil that gets heavily fished ornamentally and they always available . Suriname is not just a boat ride away. Look on the map and see how remote Suriname is. Is a territory in the northern most part of south America . Above the equator. I bet it's really hot their too .