When I think ultimate Onyx, I think of this pattern, but it may ultimately "simply" be a Tuxedo Agate (which is nothing to sneeze at, given that Onyx is usually simply black, and less glassy). Still, I'm calling it both, because I think if people are looking for Onyx energy, this has it! Message us for more info, but get this while you can!
OMG - exquisite piece of Rhodochrosite - with Onyx accents, true collector's piece, whether for aesthetic or metaphysical purposes. Signed "S. Paul." We specialize in Rhodochrosite. Selling for just over $7 a gram. Serious inquiries & offers considered.