Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE wine ( no number, grape text, winery text, appelation text, state text, name text, year number, price number, score number, cases number, drink text )
TABLE: CREATE TABLE grapes ( id number, grape text, color text )
TABLE: CREATE TABLE appellations ( no number, appelation text, county text, state text, area text, isava text )

### Question ###
Give the color of the grape whose wine products have the highest average price?

### Accurate 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