You can’t see the problem?
I can see several policy violations in your description.
Violation 1. the item is Generic Unbranded, this means that ANY seller can sell on this listing and you have created the description to be all about you and what YOU offer.
If another seller comes along and wants to sell on this ASIN, they may not want to offer a free gift box or any of the other things you have put in the description that describes YOUR business and not theirs.
Violation 2. You have in the description telling people to go to a 3rd party site (Youtube)
Violation 3. You have put personal information in your description about your business being a 5 star business,(other sellers on this ASIN may not have that claim and you may not either if you get left bad reviews)
Violation 4. you have made reference about a guarantee (you have no right to offer this on a generic listing as you do not represent all sellers on this listing)

You need to remove all of these references to YOUR business and what YOU offer and keep to the GENERIC UNBRANDED listing policy.
I would suggest taking most of the content out of your description and bullet points and keeping it to description of the item only.
Any references of WE only use, is viewed as that, YOU only use and other sellers may not.
Take out the following information…
We use only HIGH QUALITY materials and offer guarantee on our necklaces. We are a 5-Star Seller. Check our reviews and see what our customers say about us! Feel free to ask for more details! Dont wait! Contact Us!

• There are plenty of YOUTUBE videos OR
  Gifts:

If certain pieces are intended as gifts, please leave us a note in the message box when you check out… that way we can include a gift box for you. In any case all items will be gift-wrapped in a craft box.

By removing the above content, this should make the listing compliant (unless anyone else spots something extra?)