Mind Your Ps And Qs

[tommythumb]

Ps and Qs

6. Squeal breaks out when diamond is discovered! (6)
Am really puzzled by this one can anyone help please! I think the answer begins with "q".

[murraymints]

Quartz ?

[frugalfred]

lasque

[mallyh]

in my book under diamond is quarry

[frugalfred]

perhaps from Persian lashk bit, piece. a flat thin diamond usually cut from an inferior stone and used especially in Hindu work ^^

[frugalfred]

and anagram of "squeal" ^^

[mallyh]

p or q 's frugalfred

[Tilly2]

I thought the answers had to begin with p or q.

[frugalfred]

Previous experience with questions in this quiz suggest that the answers must contain p or q.