Flight period: June to August (occasionally May and September)
The Brilliant Emerald has apple green eyes and the abdomen and thorax are dark metallic emerald green with a bright bronze sheen. The wings are suffused by saffron, particularly in the female.
Male: abdomen is slightly club-shaped.
Female: the vulvar scale is the most distinctive feature as it is long and pointing downwards from the base of the abdomen. Both sexes have long anal appendages which may be visible in flight.