Yeah like I said really brittle. Anyone that tig welds will tell you this and the welding tungstens are alloyed also but they still snap like twigs with a sharp blow.
One might assume that welding is one of those things that is a bit more rigorous than your average persons finger could stand. I know with a gold band on my finger I can grab a steel pipe and it will flatten out where it hits... Not so with the tungsten... I dont seem to have the grip strength to break it (although it probably hurts a bit more than a gold one, as it isn't going anywhere)
Mine has been scraped on brick walls, i have worked on any # of things.. diving in the ocean.. any # of standard stuff.. and doesn't have a mark on it.. I have no doubt that a machinist would run his through more than I do.. but personally.. no complaints so far...
Also, earlier I stated it was a PMD coating.. It appears it's PVD.. Oops
As a side note most places offer lifetime guarantees.. It's not exactly a very expensive metal (compared to gold or platinum for sure).. and it is VERY strong compared to everything else out there..
MM.. if tungsten is not a good choice for durability.. What is?
Tungsten itself is strong and durable. You can't bend it or crush it. Its strength is 3 times more rigid than steel, 4 times greater than titanium, and an amazing 10 times that of gold. But most important Tungsten is a beautiful metal. The color is a medium light gray.
from a site selling tungsten rings
and this is a non technical description of the coating (more detail on wikipedia)
How do we create the unique two tone black designs? We start with solid tungsten comfort-fit wedding rings and then add the black coating through a black Physical Vapor Deposition (PVD) coating process. PVD is a vacuum-process technology of physically coating materials onto substrates. PVD coated films have high hardness, high wearing resistance, good corrosion resistance, chemical stability, and longer lifetime. PVD coatings are also hypo-allergenic and non-toxic. Black tungsten shows little to no wear. Over time or in the presence of increased friction or abrasion, the black coating may fade.
Not sure if any of that helps or not