20 Pa.C.S. § 7204: Diversification.

(a) Requirement.--Except as provided in section 7205 (relating to retention of inception assets), a fiduciary shall reasonably diversify investments, unless the fiduciary reasonably determines that it is in the interests of the beneficiaries not to diversify, taking into account the purposes, terms and other circumstances of the trust and the requirements of this chapter.

(b) Applicability.--Subsection (a) does not apply to any of the following:

(1) A trust which became irrevocable prior to December 25, 1999. This paragraph applies even if the action of the trustee occurs after December 25, 1999.

(2) A trust created by a revocable instrument executed prior to December 25, 1999, if such instrument is not amended after December 24, 1999. This paragraph applies even if the action of the trustee occurs after December 25, 1999.