gold dust

noun3

1. •
   Gold in the form of very small pieces, or flour gold.
2. •
   (figurative) Anything of great value.

   • The wine list harbours some great bottles, mature clarets and Burgundies as well as a clutch of fine Germans (gold-dust these days in restaurants) […] — 1996
3. •
   A basket of gold plant (Aurinia saxatilis).