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.
Gemstones by graha: who should wear one, who should not, and the substitutes.