DeLizza and Elster a/k/a Juliana Medallion design.  Montana blue narrow navettes encrusted with aurora borealis chatons.  All prong set.

Measurements:  3" in diameter, 1 1/2" profile.

In excellent vintage condition.  No visible signs of wear or damage.  All navettes are present and brilliant.  All aurora borealis chatons present and brilliant.  All prongs present and secure.  No discoloration or peeling to the gold tone.  Pin closure in perfect working condition.

This beauty is featured on page 211 of Ann Pitman's Juliana Jewelry Reference Guide.