Jewelry magnifiers, also known as jeweler's loupes, work based on the principles of optics to provide magnification and a close-up view of jewelry and gemstones. Here's a breakdown of how they work:

Magnification Power: The magnification power of a jewelry magnifier is determined by the curvature and thickness of the lens. The lens bends light rays, allowing the user to see objects at a larger size than they would with the naked eye. The magnification power is usually indicated by a number, such as 10x or 20x, representing how many times larger the object appears when viewed through the magnifier.

Lighting: Many jewelry magnifiers come with built-in lighting, such as LED lights, to enhance visibility and illuminate the object being observed. Proper lighting is crucial for examining small details and assessing the quality of jewelry and gemstones.