PRECIOUS-Gold hits 1-week high on geopolitical worries, weaker dollar

April 4 (Reuters) - Gold prices hit one-week highs on Tuesday, buoyed by a weaker dollar and as investors turned to safe-haven assets on worries over geopolitical tensions. FUNDAMENTALS * Spot gold had risen 0.3 percent to $1,255.96 per ounce by 0058 GMT, while U.S. gold futures were up 0.4 percent at $1,258.40. * Investor appetite for risk has been dulled this week by a number of factors, such as caution ahead of the upcoming meeting between U.S. President Do