ok there are like a billion threads like this that have been started recentley.
rhyzostrochus is not a gem or jewel(wtvr ya wanna call it) of the sea.
they are to diffrent things. maybe same family, still undetermined, but rhyzostrochus are are deepwater corals that yes now are hard to find...maybe not rare byy nature, but due to there location andplacement, yes in the U.S.A they are rare