A Parure is a set of jewelry meant to be worn together. Parure comes from the French word parer, meaning to adorn.
The French made this popular in the late 1600s under Louis XIV, who had 2 parure sets made in diamonds so that he sparkled during his evening salons to show his prestige and wealth. This made sense considering Louis XIV is known for his renovations making the Palace of Versailles the stunning and elegant palace of the 16th century with its renown Hall of Mirrors.

Palace of Versailes by Louis Palin
A Parure set or parure suite is a set of 3 matching jewelry items such as a necklace, brooch and earrings.
A Demi parure set or demi parure suite is a set of two matching jewelry pieces, such as a brooch and earrings. Demi means partial or half size so it makes sense that it is only 2 pieces.
A Grand parure set or grand parure suite is a full set of matching jewelry and generally includes a necklace, brooch, bracelet and earrings such as the suite below. A grand parure suite could even include a ring and a crown or tiara.
I wish you luck in finding your grand parure suite to make your life more lovely!