This is a lovely piece! Smokey Quartz is a stone of spiritual protection and purification; cleansing one's energy field of negative influences and attachments.
It creates a resonant shield of spiritual Light around the body.
Additionally, it acts as a barrier against lower energies, psychic attack, geopathic stress, and unhealthy environments.
The crystal pictured is the one you receive.
Size: 85.6mm x 25.7mm 
Weight: 103g
All measurements are approximate