UPDATE 1-Tiffany's Americas holiday same-store sales up 6 pct, raises FY forecasts

forecasts@ (Adds details on full-year outlook, impact of new tax plan)

Jan 17 (Reuters) - Tiffany & Co said on Wednesday its same-store sales in the Americas rose 6 percent in the holiday months of November and December, helping the upscale jeweler raise its 2017 full-year forecast for sales and earnings.

The increase in same-store sales was mainly due to higher demand for its high-end jewelry, watches and accessories, the company said.

Tiffany said it now expects worldwide sales to increase 4 percent, or about $4.16 billion, for the year ending Jan. 31.

Analysts on an average were expecting sales of $4.11 billion, according to Thomson Reuters I/B/E/S.

The upscale jeweler said it now expects full-year earnings to rise in high-single digit percentage range from its prior forecast of mid-single digit rise.

Global same-store sales rose 5 percent in the holiday period, with the strongest growth in its high, fine and solitaire and fashion jewelry businesses.

Total sales for the two months rose 8 percent to $1.05 billion, the company said.

Tiffany would take a $115 million-$165 million charge in the fourth quarter ending Jan. 31 due to a reassessment of deferred tax assets and tax on foreign earnings to be repatriated as part of the new U.S. tax code, the New York City based company said.

(Reporting by Siddharth Cavale and Karina Dsouza in Bengaluru; Editing by Arun Koyyur)