So I guess a white phosphorous wedding band is out of the question.
Go with Depleted Uranium.
WHAT?! Congrats, man! I thought you were already hitched - delayed ceremony?
I wanted titanium as well, but my wife (as of 12/31/12) was scared of the “if it gets pinched in an accident, you have to have industrial grade jaws (fingers?) of life to remove it” factor. I went with a cobalt band, which is still quite strong, but will just crack under severe pressure (though the Abyss reference is extremely awesome, and a lasting image in my brain for the last 20 years - which is solid enough reason for anyone). Cobalt is much “whiter” as a metal, and just as scratch resistant.
I have a tungsten carbide band and it hasn’t picked up any scratches in 2 years. My wife’s is gold, but preferred an amethyst to a diamond, so we saved a bundle on our rings.
My wife and I got titanium rings a couple years after we got married, because they were $7 (including shipping) from Amazon. We’d been shopping for rings off and on since we were married, and I was having a hard time deciding what I liked, or if I even wanted a ring, because I’d never worn one regularly. She suggested we get some cheap ones so I could wear a ring and get used to it. That was a few years ago, and we haven’t bothered to go ring shopping since.
The biggest upside I see is that the ring is entirely symbolism, because it has no material value. The ring represents our marriage, and nothing else.
The downsides people mention of it being light (so being easy to lose) and getting surface scratches are both true. Our rings don’t look quite as good as they did when new, but still look fine. The flipside, is at $7, if we lose or damage one, who cares? we’ll just get another one. I do like the piece of mind that comes with knowing if something happens to our rings, nothing of value has been lost. The symbolism will attach to the replacement ring.
I lost my (gold, original) wedding ring while camping years ago. I replaced that one with another, similar band I bought from a pawn shop. Total spent, on first ring and replacement, was around 200 bucks.
Based on this experience, my wife and I decided to buy some “vacation” wedding rings- ones which we would only wear while on vacation, and which we could cheaply replace if they were lost. I found a titanium ring on Amazon for five bucks.
It’s light. It’s very light. I hardly even notice it on my hand. And, honestly, I kind of prefer the look of titanium to gold. So now, I keep the gold ring in a drawer and just wear my “vacation” ring all the time.
Just a thought, but instead of having a whole ring, how about a split ring? That is, a ring with a small gap. So that if it needs to be removed or resized, it can be easily done by increasing the gap?
this is a bad idea.
I had my gold wedding ring split once. It hurts when your ring pinches and bites your finger.
This brought back memories of those plastic halloween spider rings that people used to give out.
Divorced in 2008, so it’s been long enough ago that it was probably easy to forget.
Have known my bride-to-be as a friend for several years, and when my long-term girlfriend and I broke up last fall, she spoke right up to let me know she was glad I was finally available. 
Best part? She said to me a couple of weeks ago, “So, once we’re living together and everything, we can watch 24 together?”
Keeper.
Downsides , you may need to take it off in a coal mine or other places with dust explosion problems.
That said a lot if industrial places disallow rings etc anyway but titanium parts are a no no.
Why is that?
It can have a thermite type reaction with iron oxide.
http://www.neoss.com/documents/downloads/materials/11020_0_Neoss_MSDS_1_-_Titanium.pdf
A friend of mine worked on a project that was using coiled tubing maxed from titanium for oil well work over activities. Titanium ( and its alloys ) were ideal materials , excepent strength to weight ratios, good corrosion resistance etc. they had built a couple of reels at great expense , then some one pointed out that well heads would have rust the possibility of gas which is. Place you do not need a thermite reaction taking place.
I have a TI band wedding ring with a strip of gold in the middle. It was a practical decision after my father and brother bent, scratched, etc their gold rings by wearing them while working (should have taken them off, I know). I also think it looks better than an all gold ring, but that’s just my preference.
Other than some minor surface scratches on the gold part, mine looks like new after 11 years. I like the light weight (I’m not a jewelry wearer) and sturdiness. And the cost savings are an added benefit.
I have one very much like this. It started out polished but after a while the raised centre dome has taken on a matt finish after lots of little scuffs etc. The lower stepped areas are still pretty shiney, I like the two-tone effect so I don’t bother getting it re-polished.
Disadvantage for grumps like me: If the marriage or the economy goes belly-up it’s pretty costume jewelry and worth what costume jewelry is worth: $3 at the Goodwill or nothing at a Mad Max dystopian marketplace. Yes, a wedding band has personal value beyond its bullion price, and titanium and stainless are very pretty (don’t know about cobalt but I’m intrigued), but someday you may need to hock it.
My experience is Biomedical grade Ti is a bastard to CNC machine. More so than stainless. Very deceiving because it looks and feels like aluminum. I have seen CNC machines that were machining implants of Stainless, try to make the same part - same CNC program, same coated insert, and the insert shatters upon initial contact - not even to any real depth.
And if it catches fire, and the FD puts water on it, it can develop temperatures so hot that water can be disassociated into hydrogen and oxygen,- an explosive combination. Similar to Magnesium. Realistically it requires a bunch of small shavings of Ti to ignite & explode (with H20 added) but if you bump your ring on a live welding rod while in the rain - KABOOM. If the blast doesn’t get you, you will be blinded by the brilliant flash - think mega flash cube (which use magnesium).
Depending on the grade of Medical Ti alloy, a 120ksi 300 Brinell Ti medical grade alloy is a long way from 45 ksi 95 brinell Alu alloy. Medical 316L is in the 55ksi and 200 Brinell hardness , so a fair way under Ti medical alloys in terms of strength and hardness.
I disagree about the feel of Ti compared to Alu but my Alu framed mountain bike rapidly looked scratched and oxidized ( ok Orange at the time of the E3 had so QC issues on their coatings) my litespeed Ti still looks like new 10 years on. The Alu frame was light but you could feel the stiffness due to the extra material needed to make up the strength. Ti was light and plinky thin.
Ok buyers justification maybe be creeping in there 
so until we get the ASTM spec on feels like , we may have to stick to handy wavy anecdotes 
Not sure it’s a downside, but if you get struck by lightning just right, you might turn into a Wolverine.
The only way you’ll grab my Gallium band is from my cold, dead fingers.