ДМДК is an iPhone application developed by GOZNAK AO, available for free in the Education & Reference category. The app allows users to access information about jewelry items and their characteristics using a unique identification number (UIN). Users can also gather details about standard or metric ingots of Russian production based on the UIN or ingot specifications. Moreover, the app provides information about organizations or individual entrepreneurs from the electronic register of legal entities and individual entrepreneurs engaged in operations with gemstones and precious metals. Additionally, users can report any violations to the regulatory authority through the application.

The app offers detailed insights into jewelry items, including general information, seller details, manufacturer information, details about precious metals in the item, gemstone inlays, and even a photo of the jewelry item if provided by the seller or manufacturer. By simply scanning the barcode containing the UIN on the jewelry item's tag, users can compare the retrieved information with the details on the item's tag to ensure authenticity.