I was also curious about a VCA. The following is a definition I Googled that might fit:
A "VCA item" refers to a piece of jewelry from the luxury brand Van Cleef & Arpels, often known by the abbreviation "VCA". These are high-end items like necklaces, bracelets, and earrings, famous for iconic designs such as the Alhambra collection, and are known for their intricate craftsmanship and use of precious materials like 18k gold.