I'm not exactally the most knowledgeable person in this particular area, but as far as I know, when it comes to cords or attachments, it's something you have to do on your own. A stone or crystal can only work and protect you to so far. There's also a point where you have to step up, feel out, be aware of, and remove these connections on your own. That way you are teaching yourself to be aware of these things, what they feel like, what they are attached to, why they're attached, and how best to remove them. And, if any try to reattach, you'll be fully aware of it and be able to stop it.
It kinda makes me think of asking a 1960's car to take you to the grocery store. The car can help you get there, but, ultimately, you've gotta be the one with your hands on the wheel and feet on the pedals.
As I said, this isn't really my area of expertise, but here are a few sites that might be able to offer you more assistance, guidance, and insight. <3
The Cord Cutting Meditation
http://cosmicawareness.org/free-mate...ng-meditation/
Cutting Energy Cords, to remove parasitical connections
http://www.soul-guidance.com/houseof...nergycords.htm
From -
http://meanings.crystalsandjewelry.c...ection-stones/
Psychic Protection :
amber (psychic shielding),
amethyst (from negative psychic energy of all kinds),
black obsidian,
Double Terminated crystals,
elestial crystals (esp psychic attacks),
fluorite,
jade (especially vs psychic attack),
lapis lazuli,
Lemurian seed crystal,
moqui marbles / moki balls (esp during shamanic work),
nuumite,
prehnite,
pyrite,
ruby,
seraphinite (serafina, chlinochlore),
sugilite,
tiger iron / mugglestone (especialy during shamanic work)
Remove psychic or etheric cords: novaculite, obsidian carved into a cutting edge (knife, arrowhead, etc.)
both Kunzite and Rutilated Quartz crystals have protective qualities that can also help you to love yourself more and alleviate sadness or depression
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I hope this has been, at least, slightly helpful for you <3