There are many things that can affect your energy body, but I will keep this post specifically on the topic of energy essence transferred to the aura from objects.
Many psychics are sensitive to feeling the essence of energy that is attached to jewelry etc. We all have this ability, it is a matter of how we are able to sense and perceive the energy. Many people aren't aware of these energies or even know that they have an energy body "aura". The average person not realizing that we all have this ability are only able to sometimes detect such energy when it is extreme - like the awesome tingly feeling or a dark weird yucky feeling when being in a room or touching an object where a strong energy exists. When that energy lies more in the middle of the scale- most people just don't notice. That doesn't mean it isn't there. Practice feeling energy when you pick up objects, it helps you learn to tune in to what it feels like. Understanding this energy transfer can help you notice when it is you need to cleanse your aura- and or recognize when someone you know needs a cleansing. Negative energies can cause all sorts of issues from physical problems to behavior differences and personality changes. This does NOT mean you are possessed. It's a kin to hanging out or talking to a friend that is always negative and you find yourself spiraling down to their level and feeling like crap- or the opposite having the best time with someone you love and feeling that blissful feeling in your soul that makes you forget what day/time it is. Those are easier to recognize and perfect examples of the attachment of the energy too your energetic body because there was an actual interaction with a person and have a reference as to why you feel a certain way rather than an energy that attaches itself to you by entering your energy body without your knowing. Children are susceptible because we are all MORE psychic and open at a younger age and as we get older our beliefs and perceptions change based on what we are taught to believe is even possible.
The first thing to learn is how to protect your aura/energy body. When you know you are going to be around a negative person or situation the simple intention of protection works best. You close your eyes and imagine a golden light surrounding you. You may call on your higher power (Source/God/Universe/Jesus/Creator) whichever resonates with you to protect you and to not allow any harmful or negative energy to enter your energy space. Ground yourself by imagining an attachment by a cord or roots from your feet or whatever you think will help you to make you feel more attached to Earth. That's it. Try it, notice the difference. You don't have to be OCD about it and do it all the time. As you practice you will learn when you need to protect yourself (such as if you are planning to meditate/astral project (another topic). To proceed onto cleansing, take several deep breaths ojai breathing (in and out of the nose with throat friction for control 10 seconds in 10 seconds out) On the inhale imagine cosmic energy and light entering your crown chakra showering your entire body and every cell with pure loving light energy and on every exhale think of any negative energy/issue/situation that is not serving you and exhale it out of your body and into the Earth. Take as much time as you need until you feel your body lighten from the removal of the unwanted energy. If you need guided meditations there are several on youtube, you can just search aura cleanse meditation and find whichever fits you best. We were told back in the day to take 10 DEEP BREATHS! But no one ever said what to do with your breath. It works! In any situation when you feel stressed, close your eyes and take your ten deep breaths and you'll notice such a difference you won't have to remember to incorporate this easy exercise no matter how busy you are.
I digressed! Sorry- back to the negative energy on objects issue. Don't accept any personal items from people you don't really know or purchased used items that may have residual energies from past owners (such as jewelry, toys that are hugged, blankets, etc) If you find that you really want an item such as this, cleanse the item and cleanse yourself from any negative energy that may be attached- before holding closely onto it, bringing it into your home or giving it as a gift. Don't be afraid- negative energy and positive energy exists in all of consciousness. We can't have one without the other. Learn how to balance the two and realize that any negative or unwanted energy is also a projection from your own consciousness. Recognize that you are helping to fuel the negative energy through your own fear of the negative energy. There is nothing to fear. If you like, black tourmaline is a stone for protection you may find jewelry or stones if you like to have something physical to help with your protection.