GemSim
3D Gem Faceting Simulator
Free · Designed for iPad. Not verified for macOS.
New Frost Edge tools are here! Select and frost gemstone edges, create advanced designs with fractional indexes, and save and share designs online.
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
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.
The developer, Xuezhong Wang, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- User Content
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Xuezhong Wang
- Size
- 71.6 MB
- Category
- Graphics & Design
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © Reverie LLC
