Plique a jour is the most difficult (and most beautiful) enamel to produce. Basically, it’s like having stained glass in jewelry form, as the light is meant to pass through each cell.
These earrings by ARK use plique a jour to form hoop earrings, accented with pink sapphires. Their site notes, “The sun symbolizes light, wisdom, truth, the light of all souls, knowledge, intelligence, wakeful consciousness, existence, immortality, and heaven.”
These are made with 18k yellow gold set with 1.32 carats of pink sapphires. They are priced at USD$6,800.