Persian blue is a slightly purplish medium-blue based on the color of the mineral lapis lazuli. This is related to the color ultramarine, that is the historical name for a pigment made from crushed lapis lazuli. The name Persian blue refers to the fact that the Middle East, namely Afghanistan, was historically the largest producer of lapis lazuli. This was imported to Europe since antiquity. In the middle ages, ultramarine was the most expensive pigment used in Europe such that the color became associated with institutions with high social status such as royal houses. The following palette includes Persian blue and a few related colors.
Lapis Lazuli
#001cff
Deep Lapis Lazulii
#0c37a0
Ultramarine
#120A8F
Neon Ultramarine
#151efc
Persian Blue
#1c39bb
Royal Ultramarine
#231d61
Persian Indigo
#32127a
Persian Blue #2
#3821e4
Electric Ultramarine
#3f00ff
Ultramarine means "beyond the sea" and also refers to the Persian source of lapis lazuli. The actual color of lapis lazuli can be seen here: