Gold’s burnished appeal in China stems in part from a lack of alternative investments. While the MSCI All-Country World Index of equities rose 18 percent this year through Nov. 22, the Shanghai Composite Index slumped 3.2 percent. Policymakers clamped down on property investments in March to cool the housing market, ordering the central bank to raise down-payment requirements for second mortgages in cities with excessive price gains.