Possible Clues:

• Give this to put the first-rate jewellery on display
• Having it on display shows it's first-rate jewellery
• Putting on the line
• Publicizing
• To have what's first rate on hand will make one dry
• Ventilating, say a grievance
• Giving a show of diamonds on hand
• Publicity for excursion
• Showing perfect circle
• That's some first-class jewellery on display