Step 1: First Circle
Open blender and delete the default object. (Keep the camera and light if you want to render)
Click Add => Mesh => Circle. On the lower left panel you should see "Add Circle". Make this circle have 36 verticies and any radius.
Step 2: Basic Shape
1. E (extrude)
2. Z (target axis)
Type 0.3 (Extrude Z 0.3). Enter.
With only the top verticies selected, scale to 0.9. Extrude Z 0.3. Scale 1.12.
In the left panel with the entire model selected, click Recalculate Normals.
Step 3: Taking Shape
Step 4: Make it Solid
On both rings, apply subdivide smooth 4 times (w=> subdivide smooth) in edit mode. Select the middle ring vertex layers and click smooth vertex until there is a pretty slope.