Definitions:

1. A brilliant blue pigment that is either extracted from mineral deposits or made synthetically. NOUN
   • Historically, ultramarine was more expensive than gold.
2. A deep blue pigment, originally made by grinding the semi-precious stone lapis lazuli. NOUN
   • The artist used ultramarine to paint the robe of the Virgin Mary.
3. Describing a vivid, deep blue color. ADJECTIVE
   • She wore an ultramarine dress that matched the ocean.

Synonyms:

• cobalt blue
• deep blue
• royal blue