Indian shares are expected to open higher on Tuesday, building on three sessions of gains, as strong company earnings, easing crude oil prices and early signs of foreign investors returning to India aid investor sentiment. GIFT Nifty futures were at 23,523.5 as of 8:05 a.m. IST, indicating a positive start for the benchmark Nifty 50, which closed at 23,440.8 on Monday. The Nifty 50 and BSE Sensex jumped 1.7% on Monday to their highest levels in over five weeks and eight weeks, respectively.