Very nice. If that were a single natural smoky quartz crystal, we would call it a "terminated" crystal and you might expect to pay around £400 ($520) for it. Unfortunately it isn't. It's a massive piece of partly-gemmy smoky quartz which has been cut and polished to artificially create a terminated point. Likely from Brazil, I would have thought. As such, I wouldn't expect it to be worth more than a quarter of that, although you may find similar items being peddled by new age/spiritualist sellers at inflated prices.