The cost is typically high because it is a custom, artisanal finish. Pricing depends on complexity (using multiple layers, integrating mica, etc.). While basic wall applications may start lower, a decorative project like a fireplace surfacing using metallic Venetian plaster can start around $2,800 to $3,500 for an average-sized feature, plus separate costs for necessary prep work and customization. The price reflects the specialized skill, custom materials, and time required for a multi-day application process.