On 31 May 2016 the Czech National Bank is putting into circulation the first gold commemorative coin from the Castles cycle. It features Kost Castle. The coin is minted from 999.9 purity gold and is issued in two versions, normal quality and proof quality, which differ in surface treatment and edge marking. Proof-quality coins have a highly polished field, a matt relief and a plain edge, while normal-quality coins have milled edges. Normal quality coins have milled edges. The coin is 28 mm in diameter, weighs 15.55 g and is 1.9 mm thick. Deviations in diameter of 0.1 mm and thickness of 0.15 mm are allowed. Upward deviations in weight of 0.062 g and in gold content of 0.01% are allowed.
The upper half of the obverse side of the coin depicts a composition of heraldic animals from the large national coat-of-arms of the Czech Republic in shields. The Czech lion is in the middle, with the Moravian eagle on the left and the Silesian eagle on the right. The portal to the caste chapel is below the composition. The name of the state in Czech “ČESKÁ REPUBLIKA”, the name of the cycle “HRADY” and the denomination and abbreviated monetary unit “5000 Kč” are located inside the portal in the lower half of the coin. The mark of the Czech Mint, in the form of the letters “Č” and “M”, is situated near the lower edge of the coin.
The reverse side of the coin features Kost Castle. The initials of the designer, sculptor Zbyněk Fojtů, made up of a composition of letters “F” and “Z”, followed by the text “HRAD” “KOST” and the year of mintage “2016”, separated by dots, are located around the upper edge of the coin.