Table schema:
CREATE TABLE GRAPES (Color VARCHAR, Grape VARCHAR); CREATE TABLE WINE (Grape VARCHAR)

Question: What is the color of the grape whose wine products has the highest average price?
SQL: SELECT T1.Color FROM GRAPES AS T1 JOIN WINE AS T2 ON T1.Grape = T2.Grape GROUP BY T2.Grape ORDER BY AVG(Price) DESC LIMIT 1