If you're considering a 3 carat lab-grown diamond ring, there are quite a few styles to choose from. A larger center stone gives you plenty of room to experiment with different shapes and settings, so the right design really comes down to your personal style.
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I've noticed that solitaire, halo, hidden halo, and three-stone designs are especially popular choices for larger lab-grown diamonds.
An oval solitaire is a great choice if you want something elegant without making the ring look overly complicated.
The elongated shape can create a flattering appearance on the finger, while a simple band keeps the focus entirely on the center diamond. For a modern bride who prefers clean and timeless jewelry, this would probably be my first choice.