In 1955, the Aurora Borealis, a coating applied to crystal stones to produce a "rainbow of colors" effect was introduced.
Aurora Borealis crystals are affordable.
( z1 possible :ARG1 ( z2 afford :ARG1 ( z3 crystal :mod ( z4 product :name ( z5 name :op "Aurora" :op "Borealis" ) ) ) ) )