An ecommerce product page has one job: convert a visitor who is already interested into a buyer. The color strategy must support this by making the product visually compelling, the Add to Cart button unmissable, the price readable, and the trust signals present.
Photography First
Product photography is the hero of every product page. The surrounding palette must be as neutral as possible: white or very light gray backgrounds, minimal chromatic UI elements, and no colored borders or backgrounds that compete with the product images. The product's own colors should be the most colorful thing on the page.
The Add to Cart Button
This is the single most important interactive element on the page. It should use your most attention-grabbing color, typically a warm accent (orange, amber, or a saturated green). It must pass WCAG contrast for its text. And it should be the only element in its immediate vicinity using that color, creating the isolation effect that draws the eye.
Price and Availability
Prices should use your strongest text color (dark base) at a prominent size. Sale prices benefit from color differentiation: the original price in a muted tone with strikethrough, the sale price in your primary or a warm accent to draw attention. Stock availability indicators (In Stock, Low Stock, Out of Stock) use green, amber, and red respectively.
Trust Signals
Shipping information, return policies, security badges, and payment method icons should appear near the Add to Cart button using muted, professional tones. They should be present and readable but not visually competing with the CTA. A subtle gray or blue-gray treatment works.
Reviews and Ratings
Star ratings universally use amber/gold (#f59e0b or similar). This convention is so strong that any other color for stars feels wrong. Use the same amber across all review displays for consistency.