Downloadable mobile application software for valuation, promotion and authentication of used and pre-owned jewelry, bags, clothing, footwear, and headgear; downloadable mobile application software for allowing consumers to determine the retail and resale values of used and pre-owned jewelry, bags, clothing, footwear, and headgear; downloadable mobile application software for database management in the field of buying, selling, pricing, valuing, and authenticating used and pre-owned jewelry, b...