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. 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.