There are several foundations that are oil-based and can provide a dewy finish to the skin. However, it's important to note that oil-based foundations may not be suitable for everyone, especially those with oily or acne-prone skin. Here are a few examples of oil-based foundations:

1. NARS Sheer Glow Foundation: This foundation is known for its luminous finish and contains jojoba oil and glycerin, which help to moisturize and hydrate the skin.

2. Bobbi Brown Skin Foundation: This foundation is formulated with olive extract and glycerin, providing a natural-looking finish while keeping the skin hydrated.

3. Giorgio Armani Luminous Silk Foundation: This popular foundation contains a blend of oils, including glycerin and jojoba oil, which help to provide a radiant and dewy finish.

4. Laura Mercier Tinted Moisturizer: Although technically a tinted moisturizer, this product contains several oils such as jojoba oil, sunflower oil, and avocado oil, which provide hydration and a natural glow to the skin.

5. Estée Lauder Double Wear Stay-in-Place Foundation: While not purely oil-based, this long-wearing foundation contains a small amount of oils, such as sunflower oil and jojoba oil, to help provide a more comfortable and hydrating feel on the skin.

Remember, it's always important to consider your skin type and personal preferences when choosing a foundation. If you have oily or acne-prone skin, you may want to opt for oil-free or water-based foundations instead.