Diamond prices are down 60% since a 2011 high, and they are still falling. It’s not all down to lab-grown diamonds, demand is down too, especially in China. No one can lab-grow gold yet, so its rarity and scarcity protect its value, but that will end too. It’s just a question of when. China launched an asteroid touch-down mission this week [https://www.spacedaily.com/reports/China_launches_Tianwen-2_asteroid_and_comet_study_mission_999.html], which will make it the 4th country/region to do so, after Europe, the US & Japan. How soon will it be feasible to mine asteroids? Who knows, but a breakthrough in space propulsion might mean the prospect happens quickly when it does. It’s possible gold has twenty years or less of being high value left. The $80 Billion Diamond Market Crash Leaves De Beers Reeling [https://www.bloomberg.com/news/features/2025-02-04/de-beers-turmoil-is-symptom-of-diamond-industry-crisis?]