This pattern is intended to look like watermarked or Moire silk. It is also found on black pieces. The pattern is more noticeable on the black pieces.
The candlestick is cased blue with satin moire finish. This is Westmoreland's #1041 candlestick which is 8-7/8" tall. Documentation for this candlestick was taken from "The Glass Candlestick Book, volume 3" by Tom Felt and Elaine & Rich Stoer.