Please don't use the term "premium domain" until you will be in active domaining for at least 2-3 years. By then you will learn what "premium" really means when it comes to domains.
.ws domains could be sold for solid amounts in some cases, but reality for this domain is low to mid $xx. Appraisals are always unfaithful and you could have luck and sell this one for more, but I think you should accept any mid $xx offer you might get. Sorry.