Intellectual property

What we sell is intellectual property: geometry and cutting instructions. So this notice matters more here than on most sites. It sets out what we own, what a file license lets you do, which names on our pages belong to other people, and what to do if you think we have used something of yours.

What we own

Unless stated otherwise, everything published on digitalgemology.com is © 2026 Compliance Condo B.V. That includes:

• the 3D models we sell, in every format we supply them in;
• the cutting files, including the GemCad files, the tier tables and the faceting diagrams;
• the 3D Gemstone Simulator, its code and the cut geometry it shows;
• all written content on this site, including these notices;
• every rendered image and preview, and the Light Return illustrations, except the pictures we publish under an open license on free pictures;
• the name Digital Gemology and our logo.

Open data: the figures and the math are free

We believe the numbers and the math behind gem cuts should be free. So everything we publish as data or as method is open to everyone, for any purpose, commercial included:

• the measured figures (brilliance, fire, scintillation, the Cut Performance Index and every other score);
• the gemstone properties, absorption spectra, glossary and lessons we publish as data;
• everything our API, MCP servers and A2A agent return, and the data files at /api/;
• how we measure: the method, the formulas and the protocol on how we measure.

All of it is licensed under Creative Commons Attribution 4.0 (CC BY 4.0). Copy it, scrape it, republish it, build on it, train on it. The one condition is credit: name Digital Gemology as the source and link to digitalgemology.com.

Two things stay ours. The 3D files and cutting files we sell are the product, and they keep their own license. And our name: crediting us is not the same as speaking for us. You may not sell, label or present anything you made from our data as a Digital Gemology product, or suggest that we made, checked or endorse it. What we guarantee is what we sell, the files themselves (terms, Articles 9 and 11). Figures or geometry that someone else has taken and republished are their responsibility, not ours.

Traditional cuts and our files of them

Many of the cuts we offer are traditional: the round brilliant, the old mine, the Peruzzi, the Mazarin and the fancy shapes every cutter knows. We do not claim to own a traditional cut as a design, and nothing here stops anyone cutting a round brilliant. The same goes for the five Platonic solids: the shapes belong to no one.

What we do own is our work on it: the specific geometry we built, the files we produced from it, the diagrams we drew, and the measurements we took. Where we rebuilt a historic cut from a published primary source, we say which one, and our rights attach to our reconstruction and not to the source.

What your file license covers

Buying a file gets you a license to use it, not ownership of it. The full wording is the Personal Use License, which you can read before you buy, and Article 9 of the terms and conditions. In short, unless the product page says otherwise:

If you need something the license does not cover, such as a commercial license to sell stones or jewelry, or use in a business or for clients, ask. The answer is often yes.

Trade marks

Digital Gemology is the name under which we trade, registered as a trade name of Compliance Condo B.V. in the Dutch Business Register.

Compliance Condo B.V. has also applied to register Digital Gemology as a trademark with the Benelux Office for Intellectual Property (BOIP). The application is pending:

We rely on the trade name under the Dutch Trade Name Act (Handelsnaamwet), on the copyright in our logo and, once registered, on the trademark. We claim no exclusive right in the words digital gemology as an ordinary description of a field of study, and anyone may use them in that sense.

What you may do without asking

• Read, print and share links to anything we publish.
• Share screenshots of the 3D Gemstone Simulator, and the images and PDF 3D gemstone reports it makes of your digital stone, as long as you do not present them as a grading report of a real stone (Article 13 of the terms).
• Quote a short passage, with attribution to Digital Gemology and a link to the page it came from.
• Use, copy and republish our figures, data and method in any amount and for any purpose, under the open data terms above.
• Read, summarize and cite our public pages as an AI assistant or search engine, or use them to train AI models. We would rather be cited correctly than not cited at all. This does not extend to the paid files, which are covered by their licenses.

What you may not do

• Redistribute a file, in its original or any converted form, outside the terms of its license.
• Sell or present anything made from our data, pages or files as a Digital Gemology product, or as made, checked or guaranteed by us.
• Re-host our pages, previews or renders, other than simulator screenshots shared as described above and the openly licensed pictures, or present any of them as your own work.
• Remove or obscure copyright notices, file metadata, watermarks or attribution.
• Use Digital Gemology, our logo or our look in a way that suggests we endorse, supply or certify something when we do not.
• Register a confusingly similar mark or domain name.

Names we use but do not own

We name other organizations and products where that is the accurate way to describe something. We are not affiliated with any of them, and nothing on our site is endorsed or certified by them.

• GemCad is the name of faceting design software by Robert Strickland. We supply files in its .asc format because that is what cutters use. We are not affiliated with it.
• GIA is a mark of the Gemological Institute of America. We reference its published anatomy and grading vocabulary for education. We do not issue grading reports and our output is not one. The 3D gemstone report in the 3D Gemstone Simulator is a report of a digital stone you set up yourself in a 3D simulator, not a grading report, appraisal or valuation of any real stone.
• AGS and ASET are marks of the American Gem Society. Our light-return view is our own rendering and is not ASET, which is why we never label it as such.
• IGI is a mark of the International Gemological Institute.
• Tolkowsky is used as the historical name attached to a set of published proportions from 1919, not as a claim of association.
• Rhinoceros and Rhino (the .3dm format) are marks of Robert McNeel & Associates, FBX of Autodesk, and glTF and WebGL of the Khronos Group. These and other file format names such as STEP, STL and OBJ belong to their respective owners and are used to describe compatibility only.
• Hearts & Arrows is used in its ordinary descriptive sense, for the pattern a viewer shows in a precisely cut round brilliant, and not as a claim of association with any brand that uses it.
• Lemon Squeezy and Stripe (checkout), Google and YouTube, Cloudflare, Trustpilot, Skool and Instagram are marks of their owners, named because we use their services.

Components we license from others

The typeface on this site, Geist (copyright Vercel), is used under the SIL Open Font License 1.1 and is served from our own domain. Where we use any other third-party component, we use it under its own license and keep that license intact.

If we have infringed your rights

Tell us and we will deal with it properly. Write to support@digitalgemology.com with the page address, an identification of the work or mark concerned, the basis of your right, and how we can reach you. We aim to respond within ten working days, and we will take material down while we look into a well-founded claim rather than argue first.

If you find our files being shared

If you see one of our files offered somewhere it should not be, we would be grateful for a link at support@digitalgemology.com. You do not need to do anything else.