Pearls are the only gems that come from the sea. They are created when an oyster covers an object with layers of nacre. There're a variety of colors available for this June birthstone. You'll find them in rose, silver, white, cream, gold, blue, gray, and black. Pearls are unique because they're the only gemstone that isn't a gemstone at all. Acquire a pair of pearl earrings from our selection and you'll feel like a beautiful mermaid has blessed you.