East Data Systems · Apps
Apps that keep your data on your phone.
We design and build focused Android apps that are private by design: no accounts, no cloud sync, and your information stays on your device.
My Gemstones
A gemstone collection catalog for Android
Photograph and catalog every stone you own, read the details straight off a lab certificate, and print labels, cards and certificates for your collection. A built-in field guide covers 79 stone types with grading guides, calculators and charts.
Concept and design by Roman Batyuschenko. Requires Android 14 or newer.
Your collection 
Every detail of a stone 
Scan a certificate 
Built-in field guide
Catalog with photos
Species, variety, weight, dimensions, origin, treatments, prices and notes, organized in folders and searchable.
Read lab certificates
Point the camera at a certificate or label and the details are filled in for you. Text is read on the phone.
Print and share
Labels, cards and full certificates with a QR code, on Letter or A4, or saved as PDF.
Field guide
79 stone types, grading guides, a glossary, calculators and reference charts.
Private
No account and no cloud. Back up and restore to a file you keep. Optional password lock.
Many languages
English and more than a dozen other languages, switchable inside the app.
Two editions
My Gemstones
$4.99
- Unlimited stones
- No ads
- Works fully offline; the app has no Internet access at all
My Gemstones Free
Free
- Up to 50 stones
- Shows a small ad, so it needs an Internet connection for the ads
- Move your collection to the full app any time with backup and restore
Documents
Have an app in mind?
We build Android apps for collectors, small businesses and specialists, from the first idea to the Google Play listing. Tell us what you need.
apps@eastdata.tech