When choosing a round moissanite ring vintage moissanite engagement ring, there are several factors to consider. The first is the design of the ring. Vintage engagement rings are available in a variety of designs, so it's important to choose one that suits your personal style and preferences. The second factor to consider is the size and quality of the moissanite gemstone. Moissanite is available in a range of sizes and qualities, so it's important to choose one that fits your budget and preferences. Finally, it's important to consider the metal of the ring. Vintage engagement rings are typically made of gold or platinum, so it's important to choose a metal that complements your skin tone and personal style.