No, they are not rare.
Its a GB english pound coin
The rarest rose is the Juliet rose which is highly sought after and expensive. Another rare rose is the blue rose.
Most of the Mary Rose gold and silver Proof and uncirculated sets and presentation packs are already available from the Royal Mint. The general circulation coin should be along shortly, if not already issued.
An Alderney 2003 gold Twenty-Five Pound coin (Elizabeth II)(The Mary Rose), uncirculated and in absolute mint condition and the original packaging, could fetch up to £225 GBP. A reputable coin dealer will be able to give a more accurate valuation.
as rare as a blue rose as rare as an ice cube in the sahara desert.
Rose - 2013 I was released on: USA: 2013 (Ivy Film Festival)
The Rose Maker - 2013 was released on: USA: April 2013
The Blood and the Rose - 2013 was released on: USA: January 2013
There are 453.592 grams in a pound. I don't know why you felt you needed to specify "of rose petals".
2013 Rose Bowl - 2013 TV was released on: USA: 1 January 2013
Mark of the Dog Rose - 2013 was released on: USA: 26 October 2013
This answer can not be answered until they begin to plan the Rose Parade for 2013.