Cafodd y capel coffa ei ddylunio gan y cerflunydd o Gymro R.L. Gapper o Aberystwyth. Mae’n eiddo i Ddŵr Cymru ac wedi'i leoli ar lan ogledd-orllewinol Llyn Celyn. Cafodd ei adeiladu ar safle'r fferm a gollwyd, Gwern Delwau, gan ddefnyddio cerrig o'r fferm hon ac adeiladau a gafodd eu dymchwel er mwyn adeiladu'r gronfa ddŵr, gan gynnwys y Capel Celyn gwreiddiol.
The memorial chapel which was designed by Welsh sculptor R.L. Gapper of Aberystwyth and is owned by Dŵr Cymru, is located at the north-west end of Llyn Celyn. It was built on the site of the lost farm of Gwern Delwau, and used stones retrieved from this and buildings demolished when the reservoir was constructed, including from the original Capel Celyn.