Appreciation, active or passive, of marital property is jointly shared. Appreciation of separate property, such as gifts and inheritances, can be more problematic.
In dual-classification, equitable distribution jurisdictions, active appreciation that results from marital efforts is marital property; party who contends that the property is separate.
In find 1) that the separate property appreciated during the marriage; 2) that the parties made marital contributions that caused the appreciation; 3) that there is relationship between the contributions and at least some of the appreciation.
Moreover, the concept of active appreciation of separate property can even extend to the productive efforts of second-tier managers of a separate property business.
See Separate Property.
See also Passive Appreciation.