Is appreciation on a separate mutual account deemed marital property?

It depends. In many cases, the court will allow a party to retain an asset brought into the marriage but the following are questions the court will consider in making its determination. Can the premarital asset be clearly traced? Did you keep the property separate and titled in your name? Or did you commingle it with marital assets? premarital assets you kept separate may be more likely to be awarded to you. Did the other spouse contribute to the increase in the value of the premarital asset and can the value of that increase be proven