I'll expand on what Southrend said to give positive uses for each of the new bracelets/necklaces too.
Bracelet of Clay can be used to the best of it's ability in the Crafting guild, where there are clay rocks and potters wheels (I don't think there's a furnace though. I may be wrong.)
Castlewars Bracelet's best use is pretty obvious, best used on a defensive player who's guarding the flag room.
Innoculation Brace is likely to see it's benefits used more often in the Zogre Thieving/Ranging area.
Abyssal Brace is again, an obvious one. Though I don't take my glory amulets into the abyss, I take rings of dueling instead, this is going to stop me from losing my pouches. Which was my only problem with being pked there anyway.
Combat Bracelet, although it doesn't explain it very well in the Knowledge Base, will tell you how many more monsters you have to kill on your current slayer task, after you've killed a tenth of your total task. So for example, if I was given 168 Lesser Demons, I'd be told how many monsters I had left to kill after I've slain 17, 34, and so on. Pretty useful for someone like me who doesn't remember his slayer gem, or leaves to get more food when he has less than 10 monsters remaining. (I've done that on 3 of my last 5 slayer tasks...)
Bracelet of Regeneration, I haven't yet had first hand experience of but as a slayer I'd see this coming in useful and saving me quite a bit of food. Also could be used in duels and death matches although taking these into the wilderness may be a little silly.
And the Phoenix Necklace, if you are interested in that as well, has it's uses in almost all combat related activities. Including slayer

, castle wars, duels, pking and so on.