"Rude", as in what? It is effective in killing bad guys, and is damned near indestructible?
And you are talking gold purity, that is something completely different. Refine that 555 gold into 999 gold, it is absolutely no different than any other gold.
That brings up something important, do you actually know anything about gold? For those that do not know, 999 gold is 99% pure, or commonly called "24 karat gold". That is what is used in coins and bullion. 555 gold is also known in jewelry as "12 karat gold", the amount that is most common in jewelry. And here is the big difference, nobody uses 24 karat gold in jewelry. About the highest I have ever seen is 18 karat gold, but that is rare. A few times I have seen 16 karat gold, once again fairly rare. 14 and 12 karat are much more common. Then you have 10 and even 8 karat, largely used in better quality costume jewelry.
But here is the thing, they would all start as 24 karat gold. Ether from bullion, or reclaimed from older jewelry where it is melted down, then refined back into 24 karat gold. Then other metals, most commonly copper is then added. So that 12 karat gold ring? Is most likely 50% gold and 50% copper.
But remember in the past when I mentioned "fungibility"? Gold is gold, it does not matter what the source is. It can be South Africa, Brazil, the US, Russia, Greece, it does not matter at all. It is all the exact same thing, the "999 or 555" you brought up is simply how pure it was refined. And based on that, what the ultimate use is. 999 for electronics and bullion, 555 for jewelry. But even that 555 started as 999 before it was mixed with other metals (once again normally copper) to achieve the hardness they wanted. Because gold is damned soft, and 999 jewelry other than as a pendant is damned stupid.
Maybe I should mention that among my many jobs, one I rarely bring up is that I worked as a pawn broker for several years. And as doing such, I learned a hell of a lot about things like gold and jewelry. Of course, that is in addition to my decades of being an amateur prospector.
Maybe you should actually take a moment here, and look up a term that is rather important that I have already dropped several times. And that is "fungibility".
Fungibility is the interchangeability of a good or asset with other specific goods/assets of the same type. It simplifies trade and exchange processes.
www.investopedia.com
I did not just use that term lightly, it is literally true when talking about things like gold or titanium. Or steel, or copper, or Light Sweet Crude, or soybeans, or Frozen Concentrated Orange Juice, or anything else. It does not matter worth a damn where it came from, it is all the exact same thing. Then you turn right around and try to vomit in the difference between smelted purity between gold for bullion and gold primarily for jewelry. Because that is the only industry that I am aware of that even cares about or buys 555 gold. The jewelry industry, because that is what most jewelry is made out of. 12 karat gold.
Just more proof that you really have absolutely no idea what you are even talking about. You just vomit up silly propaganda, not even knowing what you are talking about even means.