Imagine yourself wearing these checkerboard cushion-cut red lab-created ruby solitaire stud earrings, a vibrant addition to your jewelry wardrobe. Fashioned in sterling silver each earring simply glistens with a 7. 0mm checkerboard cushion-cut bright red lab-created ruby solitaire. Ruby is the traditional birthstone for july and epitomizes integrity, confidence and strength. These post earrings secure comfortably with friction backs.