BullionVault's gold investor index dipped in January to 51.9, the lowest reading in 18 months. Any number above 50 indicates there are more buyers than sellers of physical gold, it continues to remind investors that the yellow metal is well off its highs from September 2011. BullionVault's Miguel Perez-Santalla tells TheStreet's Joe Deaux that the weakened sentiment likely occurred from investors squaring their books for end-of-year tax purposes.

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