Sunflower

Blue: this box has no false statements. / the gems are in a box with a six word statement. / this statement contains six words.

White: the gems are in a box with a statement containing the word 'six'. / there is a box that contains a mix of true and false statements. / this statement contains five words.

Black: the blue box contains exactly one false statement. / the gems are in a box with a five word statement. / this box has no true statements.

A: ? not blue

Blue: the gems are in this box. / the above statement is true.

White: the gems are not in this box. / the above statement is false.

Black: the top statement of each box is true. / the above statement is true.

A: blue

Blue: the gems are in a box with two statements. / that is true.

White: the gems are in the blue box.

Black: the blue box has at least one true statement. / the white box has at least one true statement.

A: Black