Write a review Your name* Your e-mail* (Not for publication) Rating ★★★★★ Excellent ★★★★☆ Very good ★★★☆☆ Average ★★☆☆☆ Poor ★☆☆☆☆ Terrible Your review * * — Required information Gemstone Energy Management ← View details Dersingham, 1 & 3 Amber Manor Road, Kings Lynn, Norfolk PE31 6LD, United Kingdom, Dersingham, England