Gold prices gain Tuesday as the Ukraine crisis remains on the minds of investors, but Aurum Options Strategies principal gold trader Paul Sacks tells TheStreet's Joe Deaux investors should be careful of rising prices as the end to crisis in Ukraine could push the yellow metal lower. Sacks points out that low volumes, especially in options trading, suggest many traders are on the sidelines -- not too certain that Ukraine worsens, but not confident to bet against an unexpected clash.

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