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Could you elaborate on the comparison between gold and diamonds as investments? Is gold truly a superior choice in terms of financial returns, or does diamonds offer unique advantages? How does the volatility of each asset class compare? Additionally, considering the portability and liquidity of these investments, which one is more convenient for investors? Furthermore, how do the storage costs and insurance requirements for gold and diamonds differ? Could you also discuss the long-term value retention of these investments and their respective risks? Lastly, could you provide insights on the cultural and emotional factors that might influence an investor's decision in choosing between gold and diamonds?