Marquise Cut Solitaire Diamond Engagement Ring in White Gold.  This modern engagement ring features a .98 carat marquise cut diamond set in 14 karat white gold. This marquise is flanked by two (2) .20 carat tapered baguette diamonds in a neat and minimalist design. Held securely by six (6) prongs, including two on each end, this is a wonderful example of a marquise cut engagement ring with its thin and elegant lines.