alhajar

To adorn someone with jewels (alhajar a la novia con las joyas de la familia) or, in an extended sense, to furnish a home lavishly and elegantly (alhajar la casa). A somewhat literary, old-fashioned verb — everyday Spanish just says poner joyas or amueblar.

• La abuela alhajó a la novia con un collar de perlas. — The grandmother adorned the bride with a pearl necklace.
• Alhajaron el salón con muebles antiguos y candelabros. — They furnished the living room lavishly with antique furniture and candelabras.
• En el retrato, la reina aparece alhajada de pies a cabeza. — In the portrait, the queen appears bedecked with jewels from head to toe.

Using alhajar for ordinary furnishing or dressing — it specifically implies richness and ornamentation, so it reads as elevated or old-fashioned outside contexts that genuinely call for that.

Often confused with amueblar.