I am hoping to sell a beautiful gift that I have.
Do you have any plans with what you are going to do with the money?
I want to use the money for buying something really cool
I understand you want to buy a trendy item. Have you thought about how you will value the beautiful gift you sold vs. the "cool" item you'll acquire?
I am going to sell it for a high price, it's a hot item to buy.
Selling an item when it's price is high is a great idea, however it may not be smart to use the money on something that is not practical. If you blow the money then you will probably end up missing the item despite you getting a good price for it.