The Cheltenham-born back-row forward, who joined from Newport in 2002, made his 250th competitive appearance for the club in the recent Aviva Premiership fixture against Worcester.
Gloucester head coach Bryan Redpath said of the 33-year-old: "Every team needs someone like Bucko, someone who delivers a consistent level of performance every week, someone who turns up every week and simply gets on with it without complaining.
"He's been a key member of our squad for a long time now and it's tribute to his professionalism that he's still playing as well as ever."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The Barbarians are one of the top invitational rugby sides with a long history and classic rugby jersey.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Lions get ready for their matches with this green training jersey. It's what the players wear. Get in the Gear!
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.
$29.99
The Lions are ready to get their Australia tour underway. They arrive in Perth on Monday.
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.
