Johnson Matthey does their pgm (platinum group metals) salesout of
their new york office in 580 5th ave. a pure ruthenium ring would
not be very practical in that it would be extremely brittle, cheap
but brittle. iridium is i believe the must expensive pgm at
1800-2000/gram depending if your buying or selling. remeber the bid
ask spead in pgm's is far greater than with gold. millions of
contracts of gold are bought and sold daily, not so with the pgm's.
Inco in England also is a very good supplier but may be to large.