Create a digital image depicting three separated rings arranged on a black velvet cloth. The first ring should be a classic solitaire style, featuring a single sparkling diamond prominently set in the center. The second ring should be a trilogy ring, showcasing three equally sized gemstones, symbolizing past, present, and future. The third ring should be a diamond band ring, with small diamonds encrusted along the band for a subtle yet elegant touch. Pay attention to the lighting and shadows to enhance the brilliance and allure of the diamonds against the black backdrop.