A 1-carat oval diamond can be perfect for someone who loves a flattering look on their finger with a good sparkling effect. A 1-carat oval diamond is an elongated shape, which is why it is bound to look larger than round, princess, or ascher cuts of the same carat weight. Choosing an oval cut with 1.35 to 1.50 length-to-width ratio is recommended for an even and equal sparkle with minimum bow-tie effect for maximum fire and brilliance.