I am delighted to recommend Eric Emms as an exceptional teacher and specialist in gems and gemmology.

Eric guided me in preparing for the Gem-A Diamond Diploma examination, explaining with great clarity the full scope of the syllabus – from diamond prospecting and properties to manufacturing, grading, and the identification of treatments. His structured approach made complex topics accessible and ensured that nothing was overlooked.

Alongside subject knowledge, Eric provided invaluable exam preparation. Working through past papers together, he helped me refine my understanding while also sharing practical strategies on time management and exam technique. His support gave me the confidence to approach the exam with focus and assurance.

What sets Eric apart is not only his expertise but also his approachable and encouraging teaching style. I wholeheartedly recommend him to anyone seeking to expand their knowledge of gems or prepare for professional gemmological qualifications.

-Anna Niwinska, October, 2025.

“Great stones, from one of the most trusted and experienced gemmologists in the business. Whole experience was smooth and simple- stones arrived on time and as described and Eric couldn’t have been more helpful in answering my questions. I would definitely recommend Eric Emms as a supplier of gemstones.

— Claire C., Cheltenham UK, June 2020.

“I was made aware of your unique and extensive expert knowledge of gem stones several years ago, but I am repeatedly amazed at the seemingly endless stream of facts and variable analyses that I keep seeing in your postings on the internet.”

— Malcolm B., Stafford, UK, June 2020.