Smoky Quartz engagement rings? Absolutely! Diamonds may be a girl's best friend, but Smoky Quartz engagement rings are a unique, original, and a far more affordable choice. Brown gemstones are gaining in popularity and smoky quartz is an affordable choice. A smoky quartz ring goes well with autumn colors and evening wear. 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.