Related Clues:

• Stone-like marble with layered colours
• Quartz with alternating bands of colour
• A semi-precious stone
• A form of quartz
• Smooth stone with bands of colour
• Agate with different layers of colour
• Weep at last. Does that make it clear?
• That makes it begin 1 across that one may weep with the last muddle
• It's clear that that's enough to make one weep at last
• Two-thirds of the oxygen makes it precious hard
• At last it's confused to make the cry clear (7)
• There's a call at last for this to be so clear
• It's clear that that's what makes one weep at last
• She's disreputable enough to make one green, but not with envy
• Weep over the last quarts of it, by the sound of it