Assets, unless otherwise approved by the director, allocated to a separate account established pursuant to section 20-651 shall be valued at their market value on the date of valuation, or if there is no readily available market, then as provided under the terms of the contract or the rules or other written agreement applicable to such separate account, provided that unless otherwise approved by the director, the portion if any of the assets of such separate account equal to the company’s reserve liability with regard to the guaranteed benefits and funds referred to in subsection C of section 20-651 shall be valued in accordance with the rules otherwise applicable to the company’s assets.