Ztevixan

Ztevixan is a gem-cutting workshop. Pick a rough stone and a design, set the geometry, grind it against the spinning lap, and reveal what your angles did to the brilliance and the fire of the finished gem. THE WHEEL Choose a design and an unlocked rough, check the setup, and start cutting. During a session you set the facet angle and the rotation index to match the current target, then drag the stone into the lap to grind. Brilliance and fire read live alongside your progress. Accurate angles and correct indexing build a better stone; sloppy ones open windows and cost you the score. The optical model behind it is simplified but consistent, so experimenting actually teaches you something. TWENTY DESIGNS Round, step, mixed and fantasy families — standard round brilliant, cushion, oval, emerald, asscher, princess, marquise, pear, heart, trilliant, portuguese, checkerboard and more. Each carries a diagram, a description, a difficulty and a full cutting schedule, with crown and pavilion target angles, indices and facet counts. Filter by family, then load a blueprint straight onto the wheel. TWELVE MATERIALS Quartz, amethyst, citrine, topaz, tourmaline, peridot, spinel, sapphire, ruby, zircon, cubic zirconia and diamond. Every card carries its refractive index, hardness, critical angle and dispersion with an indication of its fire potential, and its detail page adds crystal habit, optical properties and what it takes to unlock it. Which stone you can afford to be imprecise on is a property of the stone. THE JEWEL CASE Finish a cut and the stone is revealed with its light and colour, its brilliance, its fire, its window count and its grade. Everything you complete is kept with its material, design, date and scores, and can be reopened to inspect. MASTER CUTS Eight challenges from First Light to Master's Diamond, each fixing a design, a material, a brilliance target and an angle tolerance. Earn stars, track your best results, and go back to familiar designs to do them properly. IT REMEMBERS WHERE YOU STOPPED An unfinished session keeps its angle, its index and the work already done, so you can leave a cut half-made and come back to the same setup. Progress, profile and settings are stored on the device. Personalise the cutter profile with a name and a photo, follow your statistics — stones cut, best brilliance, designs mastered, materials unlocked — and set the interface and workshop sounds separately.