Lab Emerald engagement rings? Absolutely! Diamonds may be a girl's best friend, but Lab Emerald engagement rings are a unique, original, and a far more affordable choice. The birthstone of May, an emerald ring symbolizes the eternally returning spring. The velvety green color of emerald is a perfect match for spring and summer fashions. Gem of hot summer nights and steamy red sunsets, ruby is the birthstone of July. Show the world the passions within you with a fiery ruby ring.