The British company that brought us the “limited edition”
Black Pearl regulator has brought another high-end model to
American divers: the ATX200 Tungsten regulator. The product
is being promoted abroad with ads extolling its “extremely
hard, low-friction Diamond PVD (Physical Vapour Deposition)
coating finish.”
Despite its name, the regulator does not contain tungsten.
  Tom Phillipp, product manager for Aqua Lung America, which
  distributes Apeks products in the U.S., told Undercurrent that
  while the new satiny finish is much harder than the standard
  chrome plating, “Tungsten refers to the color only.” But from
  a marketing standpoint, it sounds a lot sexier than gray-white,
  the color of tungsten. Of course, the Atomic regulator isn’t
  atomic. Nor does the Henderson Gold Core wetsuit lining
contain gold. 
The new Tungsten model is, in effect, the popular Apeks
  ATX200 (rated second only to the Atomic M1 among high-end
  regulators by Britain’s DIVE magazine). It differs only because
  it is coated with a titanium/zirconium/chromium compound
  and is designed to achieve “extreme protection and high
  resistance to wear.” DIVE, the journal of the British Sub-Aqua
  Club, tested it under extreme conditions and even ran over it
  with an inflatable boat on a trailer. The Tungsten passed the
  magazine’s toughest test ever, according to the editors. Their
  conclusion: “The chances of destroying this regulator while
  diving are practically nil.” Which raises the question: Aren’t
  the chances of destroying a regulator while diving practically
  nil anyhow?”  
John Bantin, technical editor of Britain’s DIVER magazine,
  says the Tungsten’s “inhalation characteristics cannot be faulted.”
  But he was unhappy that the undersized exhaust tee sent
  exhaled bubbles directly in front of his face when trying to
  shoot photos. Still, he says that the unit has “all the characteristics
  and features you might expect of a top regulator.”  
There is no question that the ATX200 is an exceptional
  regulator, which makes the ATX200 Tungsten with its coat
  of many metals equally exceptional. But, Bantin asks, “If a
  regulator can give you as much air as you need, what’s the difference?”
  Well, cachet for one thing. When he unpacked his
  Tungsten on a Red Sea trip, Bantin said its distinctive finish
  elicited comments like “trust you to have the best,” while another
  diver asked “What’s wrong with an ordinary regulator?’”  
In the U.S., the Tungsten lists for $765, $70 more than the
  everyday ATX200, not a lot if you’re so fastidious that avoiding
  scratches on your regulator housing is important. But as Bantin
  put it, this baby “marks the user as someone who demands
  bling.” Make that bling bling.