About Jewel
The Jewel is a deep-zoom location on the upper boundary of the Mandelbrot set, near c ≈ −0.235 + 0.827i, where the iteration count climbs sharply and the boundary fractures into thousands of crystalline facets. At this zoom level (≈ 4 × 10⁻⁵ across), the structure looks more like a cut diamond than a fractal: tight clusters of dendrites surrounding a central minibrot, each refracting iteration counts into long color gradients. Mandelbro pairs this view with the ice palette and a high iteration count so the boundary stays crisp under deep magnification. Push the zoom another few orders of magnitude in and the perturbation pipeline takes over automatically.
About the Mandelbrot set
The Mandelbrot set is the set of complex numbersc for which the iteration zn+1 = zn2 + c does not escape to infinity. Its boundary is a fractal of infinite detail: every region you zoom into reveals new spirals, dendrites, and miniature copies of the entire set. Jewel is one of the most recognizable patterns in this boundary.
How Mandelbro renders this view
At this zoom level, Mandelbro uses standard double-precision rendering with a parallel pool of Web Workers — every CPU core in your device runs the escape-time algorithm in parallel on a slice of the viewport. Push the zoom another twelve orders of magnitude in and the renderer automatically switches to its perturbation pipeline, which uses one high-precision reference orbit to keep deep zooms sharp. See how Mandelbro works for the full explanation.