lusternoun [ U ]
us/ˈlʌs·tər/luster noun [ U ] (BRIGHTNESS)
the brightness of a smooth or shiny surface:
The polished furniture had a rich luster.
luster noun [ U ] (SPECIAL QUALITY)
the quality of being attractive or special:
The commercial district around the theater had lost its luster, becoming a magnet for the homeless and driving moviegoers elsewhere.
lustrous
adjective [ not gradable ] us/ˈlʌs·trəs/
This conditioner will give your hair a lustrous glow.