This is a lovely design from Nim Teasdale. Here is how Nim describes it:

The idea of three wishes is a theme that runs through many stories and fables.

In keeping with this theme, this top down crescent shawl is adaptable to your wishes:

Begin with an optional plain section if you like.

Extend either lace section to any size (or you can reverse them).

Add beads for a starry twinkle.

Choose lace weight or fingering.

The pattern itself is both written and charted, with pattern rows on the RS only.

Nim's pattern leaves a lot up to the desires of the knitter and her suggested yardage amounts for this pattern is anywhere from 200 yards to 1,000 yards, depending on what you decide to do. The original shawl in the photo used 260 yards (250m) to knit.

Her sample used size 5/0 beads.

The number of beads needed is very variable, depending on how you design your personal shawl.