diff --git a/manim/mobject/types/vectorized_mobject.py b/manim/mobject/types/vectorized_mobject.py
index 791b28bf5a..9422a127d3 100644
--- a/manim/mobject/types/vectorized_mobject.py
+++ b/manim/mobject/types/vectorized_mobject.py
@@ -167,9 +167,12 @@ def __init__(
         #     fill_color = kwargs["color"]
         #     stroke_color = kwargs["color"]
         if fill_color is not None:
-            self.fill_color = ManimColor.parse(fill_color)
+            self.set_fill(color=ManimColor.parse(fill_color), opacity=self.fill_opacity)
         if stroke_color is not None:
             self.stroke_color = ManimColor.parse(stroke_color)
+            self.set_stroke(
+                color=ManimColor.parse(stroke_color), opacity=self.stroke_opacity
+            )
 
     def _assert_valid_submobjects(self, submobjects: Iterable[VMobject]) -> Self:
         return self._assert_valid_submobjects_internal(submobjects, VMobject)
@@ -240,7 +243,7 @@ def generate_rgbas_array(
         ]
         rgbas: FloatRGBA_Array = np.array(
             [
-                c.to_rgba_with_alpha(o)
+                c.to_rgba_with_alpha(c._internal_value[3] * o)
                 for c, o in zip(*make_even(colors, opacities), strict=True)
             ],
         )
diff --git a/manim/utils/color/core.py b/manim/utils/color/core.py
index 88eaca23b4..bfc1de9168 100644
--- a/manim/utils/color/core.py
+++ b/manim/utils/color/core.py
@@ -1408,8 +1408,7 @@ def color_gradient(
         raise ValueError("Expected 1 or more reference colors. Got 0 colors.")
     if num_colors == 1:
         return parsed_colors * length_of_output
-
-    rgbs = [color.to_rgb() for color in parsed_colors]
+    rgbas = [color.to_rgba() for color in parsed_colors]
     alphas = np.linspace(0, (num_colors - 1), length_of_output)
     floors = alphas.astype("int")
     alphas_mod1 = alphas % 1
@@ -1417,7 +1416,7 @@ def color_gradient(
     alphas_mod1[-1] = 1
     floors[-1] = num_colors - 2
     return [
-        rgb_to_color((rgbs[i] * (1 - alpha)) + (rgbs[i + 1] * alpha))
+        rgba_to_color((rgbas[i] * (1 - alpha)) + (rgbas[i + 1] * alpha))
         for i, alpha in zip(floors, alphas_mod1, strict=True)
     ]