OECD (2021), "71 Pearls, precious or semi-precious stones, precious metals; imitation jewellery; coin: Korea: Harmonised System 2012", in International Trade by Commodity Statistics Volume 2020 Issue 6: Austria, Korea, Slovenia, Spain, Turkey, OECD Total, EU28-Extra, OECD Publishing, Paris, https://doi.org/10.1787/1b31014b-en.