That blue buckle would do.

Then the man will get the tray out of the window.

I think you'd better be the one,' it said to Anthea.
'We'll wait out here.' So the others flattened their noses against the shop window, and presently a large, dirty, short-fingered hand with a very big diamond ring came stretching through the green half-curtains at the back of the shop window and took away the tray.
They could not see what was happening in the interview between Anthea and the Diamond Ring, and it seemed to them that she had had time--if she had had money--to buy everything in the shop before the moment came when she stood before them, her face wreathed in grins, as Cyril said later, and in her hand the charm.
It was something like this: [Drawing omitted.] and it was made of a red, smooth, softly shiny stone.
'I've got it,' Anthea whispered, just opening her hand to give the others a glimpse of it.

'Do let's get home.

We can't stand here like stuck-pigs looking at it in the street.' So home they went.