Those bitcoins that made you gasp at $300 just a couple of weeks ago? They were a bargain — the value of 1 BTC has now passed $500.
That means: if you bought a stash of bitcoins at their absolute highest peak price of $266* in April 2013 and then felt nauseous as the price plunged to $65 the same week, you have now almost doubled your investment. Provided you didn’t cut your losses and sell prematurely, that is.
The bitcoin value began rising again almost immediately after that, breaking through the $100 mark again before May and hovering around that region throughout the northern hemisphere summer. It broke through $200 in late October and since then the price charts have been close to vertical, hitting $300 on 6 November and $400 on all exchanges by 15 November.
Rest of the article here: http://www.coindesk.com/bitcoin-price-hits-500-50x-increase-12-months/