I found this flicker account someone has. This picture is positively gorgeous!
The narthex of St. Gregory The illuminator Armenian Orthodox Church
Yes, it's in Yerevan. One of those photos shows the stone reliquary where St Gregory's small relic is placed. Usually believers after entering the church first kneel and kiss it, then move to the nave. The lamp hanging over that relic was a gift by the late Russian Orthodox Patriarch, as one can read on the lamp.