# GemSim — 3D Gem Faceting Simulator > 3D Gem Faceting Simulator (iPhone/iPad app by Xuezhong Wang.) - Source: https://appshunter.io/ios/app/gemsim/id6797285210 (this page in markdown: same URL + `.md`) - Developer: [Xuezhong Wang](https://appshunter.io/developer/6797285212) - Category: Graphics & Design - Price: Free - Age rating: 4+ - Requires: iOS 15.0 · 68 MB - Languages: American English - Released: 2026-08-25 - Data updated: 2026-10-09 ## What is GemSim? Design your gemstone before you cut it. GemSim is a free 3D gemstone faceting simulator for designing, visualizing, and refining gemstone cuts before touching a real stone. Whether you’re learning faceting, experimenting with new ideas, or recreating published designs, GemSim gives you powerful design tools on iPhone, iPad, and the web. Interactive 3D Simulation • Rotate, zoom, and inspect your gemstone from any angle • See design changes instantly in 3D • Preview gemstones with realistic rendering • Analyze light return, windowing, and head shadow Faceting Design Editor Create and modify designs with detailed faceting controls. • Add, edit, reorder, duplicate, and delete tiers • Control facet angles, depths, and indices • Create and reuse custom index sequences • Select meet points directly from the 3D model • Use fractional indexes for advanced designs • Toggle tier visibility and undo changes Frost Edge Create decorative frosted edges directly from the 3D model. • Select individual edges or groups of symmetrical edges • Control the width of the frost strip • Frost crown, pavilion, and girdle edges • Automatically generate editable frost tiers • Preview frosted facets with realistic rendering • Include frosted facets in printable cutting diagrams Design Library Explore thousands of classic and public gemstone designs. Search by shape, design name, designer, dimensions, and more. Load a design and immediately start exploring or editing it. Cloud Storage & Sharing Create a free GemSim account to save designs in the cloud and access them across devices. • Store up to 100 cloud designs • Share designs using public links • Share privately with specific GemSim users • Choose View Only or View + Copy access • Manage access independently for each design An account is optional. Core design and simulation features remain available without signing in, and you can continue saving and opening files locally. Import, Export & Print • Save editable GemSim project files • Export designs as 3D models • Generate printable cutting diagrams and instructions • Use local files without an account Learn and Experiment GemSim is built for beginning cutters, experienced faceters, hobbyists, students, and gemstone designers. Experiment with angles, indices, proportions, meet points, frost patterns, and complete designs without risking valuable rough material. Make mistakes on the screen instead of on the dop. GemSim is free to use, with no subscription required to create, edit, and simulate gemstone designs. Start designing today and discover what’s possible before you make the first cut. ## Is GemSim safe? Not enough ratings yet to assess GemSim. ## Is GemSim legit? GemSim has limited verification signals. The AppsHunter Legitimacy Score for GemSim is 58 out of 100 points across 7 verification signals from App Store and developer data. ## Version history (last 2 releases) ### 1.1 — 2026-09-11 Frost Edge Add decorative frosted edges directly from the 3D viewport. Select individual edges or use symmetry to quickly select a group of related edges, adjust the frost width, and let GemSim automatically generate the required frost tiers. You can frost edges on the crown, pavilion, or girdle. Generated frost tiers remain fully editable and are supported by realistic rendering, window checking, and printable cutting diagrams. Fractional Indexes GemSim now supports fractional index values, providing greater precision for advanced faceting designs. Fractional indexes are particularly useful for Frost Edge, where the orientation of an existing edge may fall between standard whole-number index positions. User Accounts & Cloud Storage You can now create a GemSim account and save your designs to the cloud. Cloud designs can be accessed across your devices, while the existing local Save and Open workflow remains available without signing in. Each account can currently store up to 100 cloud designs. Flexible Design Sharing Share a cloud design using a public link or directly with specific registered GemSim users. You control the access level for each shared design: • View Only — Recipients can view and explore the design without modifying it. • View + Copy — Recipients can make their own copy and edit it independently. Direct sharing uses unique GemSim user handles, so you don’t need to exchange email addresses. Public sharing links can also be regenerated whenever you want to invalidate an old link. ### 1.0 — 2026-08-25 No release notes. ## Apps similar to GemSim | App | Rating | Price | Category | | --- | --- | --- | --- | | [Photo to Sketch - Drawiq](https://appshunter.io/ios/app/photo-to-sketch-drawiq/id6747050806) | — | Free | Graphics & Design | | [Bezel: Jewelry Design Studio](https://appshunter.io/ios/app/bezel-jewelry-design-studio/id6787937892) | — | Free | Graphics & Design | | [Colorific: Color Palette](https://appshunter.io/ios/app/colorific-color-palette/id1661643455) | 5.0 (6) | Free | Graphics & Design | | [Stencil AI - Photo to Stencil](https://appshunter.io/ios/app/stencil-ai-photo-to-stencil/id6759668539) | 4.8 (36) | Free | Graphics & Design | | [BLNG AI – Jewelry Design App](https://appshunter.io/ios/app/blng-ai-jewelry-design-app/id6454143521) | 4.5 (8) | Free | Graphics & Design | | [Naomi Animation](https://appshunter.io/ios/app/naomi-animation/id1561011767) | 3.2 (226) | Free | Graphics & Design | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-09.*