1. She was very beautiful.

2. She was beauty itself.
3. She was all beauty.
4. She was a beauty.
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Are they grammatical and do they have the same meaning? Do you have other expressions describing that a woman is very beautiful?

3 is not used; the others are correct.

Look up synonyms for beauty or beautiful.

http://www.synonym.com/

Yes, all four sentences are grammatically correct. However, they differ slightly in terms of their meaning and emphasis.

1. "She was very beautiful." - This sentence simply states that the woman in question was extremely beautiful. It is a straightforward and direct statement.

2. "She was beauty itself." - This sentence uses a figurative expression to emphasize the woman's beauty. By saying she is "beauty itself," it suggests that her beauty is the epitome of what beauty is. It conveys a sense of awe and admiration.

3. "She was all beauty." - Similar to the previous sentence, this expression uses figurative language to accentuate the woman's beauty. It implies that her entire being is encompassed by beauty, leaving no room for any flaws or imperfections. It emphasizes the idea that she is wholly and unequivocally beautiful.

4. "She was a beauty." - This sentence is a more casual way of expressing that the woman is beautiful. It is commonly used to refer to someone who is physically attractive. The use of the indefinite article "a" suggests that her beauty is a notable characteristic, but not necessarily the most outstanding or extraordinary feature about her.

Other expressions to describe a woman as very beautiful could include:

5. She was stunning/gorgeous.
6. She was a knockout.
7. She was captivating.
8. She was a sight to behold.
9. She took my breath away.

Remember, these expressions can vary in intensity and connotation, so it's important to consider the context and the level of admiration you want to convey.