Hi @danielle30 , you could
create an asset or sub asset account for the investments, named unrealized gain on investments. Create an equity account named similar. a journal entry for an increase in value : debit asset unrealized gain on investments and credit equity unrealized gain on investments. For a decrease in value : debit equity unrealized gain on investments and credit asset unrealized gain on investments. When the gain are realized, you could decrease unrealized gain and same for the opposite. Comment below, cheers.