Diamond Cards are a tool to facilitate better, healthier, more even whole-class discussion. Particularly effective with an able GCSE group, these cards are life-savers for the kind of class which is struggling with discussions - either because a few loud voices tend to dominate, or because active group discussion fizzles into silence when you ask for feedback.
Just print the PDF off onto coloured card or paper, divide into 4, laminate and you're all set. The idea is that each group gets one Diamond Card. Students in the group take it in turns to hold it.
At the end of the group discussion, the Diamond Card holder must amalgamate all the 'glowing embers' of ideas into a 'glittering diamond' and feed back to the rest of the class. You don't need to take 'hands up' feedback, and nobody feels on the spot, as they are aware in advance of the responsibility. I hope it works as well for you as it has for me!