Noble Grape - what does this mean?

The phrase "noble grape" is a classical term, not often heard today, used to describe the grapes traditionally associated with the highest quality wines.

To be considered a NOBLE GRAPE -

• It has to be able to make top quality wine by itself without any additions or modifications.
• It has to be grown in different regions of the world, not just in its native region.

Historically speaking, the noble grapes are comprised only six varieties - 3 whites and 3 reds.
WHITES
Chardonnay
Riesling Merlot
Sauvignon Blanc

REDS
Merlot
Pinot Noir
Cabernet Sauvignon

The term is not as commonly used today, partly because of the huge number of hybrid grape varieties, perhaps that is because some feel the term "noble grape" which (originated in France) may unfairly degrades varieties grown in other regions.