Playing in the final match of his international career, the Wales winger scored the last try of the game in the 24-18 defeat to Australia at the Millennium Stadium.
"I'm sorry we could not win," said Williams, a competitor to the end who was clearly emotional as he was interviewed on BBC1 immediately after the match.
"Australia were the best side."
Williams' final score increased his record for tries for Wales to 58, in his 87th Test.
"It's meant everything (to play for Wales)," he said.
"Growing up as a child that's the only thing you want to do. I have been very privileged and lucky to have that chance. I've had the best time of my life.
"Every time I pull on this jersey it's the best feeling ever. I'm going to miss it."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.