If your pukhrāj or nīlam has done nothing for you in years, there is a good chance nobody ever put life into it. What the jeweller calls energizing is a wash. This is the Tantric method of prāṇa pratiṣṭhā, the way my jyotish guru taught it, with the full mantra.
Rudrākṣa and gemstones, prescribed from the chart: which one, why, how to wear it, and how to tell a real one.