Before you can answer 'what is safe,' you have to define what the hazard is that you're worried about.
Moving machinery catching on things? Maybe the ring on a neck chain and the watch hanging from a belt loop are good solutions. Better re-think the gloves, though.
Yet hanging the watch from a belt loop, or the ring from a chain, won't help if you're worried about arc-blast. Exposed to a good flash, that metal becomed just so much molten shrapnel. The same applies to earings and dental braces, btw.
Tatoos as a solution? Sure- until you run into some neanderthal with a 'no tats' policy, who thinks your 'ink' has gang / political / criminal connotations. Damned if you do, damned if you don't.
One cannot ignore social mores. Let's face it: most folks, in most of the world, consider the visible display of marital status as one of the most important rules to follow. Why do you think Amish men all have the same bushy beard? Here, the most common form of such notification is the wedding ring .... and most men would rather risk losing a finger to getting a midnight "Bobbitectomy." Let's face it- once the seeds of suspicion are sown, it's nearly impossible for harmony to return to the household.
Most electrical work, IMO, does not involve directly working with electricity or in close proximity to moving machinery (at least not of the sort that will yank off fingers). So, I don't think there's a 'one size fits all' answer. Not for every company, every person, or even every moment of the day for any one person. At some point the brains have to kick in and judgement be exercised.
Where the removal of jewelry is prudent, I suppose it's important that we explain, in advance, to others in our lives why we believe it's necessary. Just as we would tell a cop "I ran that red light because my wife in having a baby," we need to say "Honey, I'm leaving my ring on my dresser on work days because I want to survive the day."
