Operating an online marketplace for buyers and sellers of diamonds; providing online searchable databases featuring classified advertising listings for diamonds; providing business and consumer information about diamonds for sale and available price quotes for diamonds via the Internet and mobile electronic communications networks; providing a website featuring consumer product information about diamonds that allows users to input their preferences and find diamonds based on logic controls defined by user-configurable settings via the Internet and electronic mobile communications networks; advertising and marketing services, namely, assisting diamond dealers with creating and customizing advertisements and advertising strategies for dissemination via electronic media specifically the Internet; dissemination of advertising for others by means of electronic communications networks; vertical ad network services, namely, providing and renting advertising space on the Internet for others within the diamond industry; providing consumer information reports on diamond histories via the Internet; providing diamond inventory management to the diamond industry