# Carats – Gem Weight & Jewelry — Carat Estimator & Converters > iOS app to calculate gemstone carat weight from dimensions. (iPhone/iPad app by Verosocial Studio.) - Source: https://appshunter.io/ios/app/carats-gem-weight-and-jewelry/id429201473 (this page in markdown: same URL + `.md`) - Developer: [Verosocial Studio](https://appshunter.io/developer/354566841) - Category: Utilities, Business - Price: $0.99 - Rating: 3.70/5 from 3 App Store ratings · 6 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 5 MB - Languages: American English - Released: 2011-04-13 - Data updated: 2026-08-21 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/carats-gem-weight-and-jewelry/id429201473/reviews.md ## What is Carats? If you work with gemstones, buy loose stones, do repairs, or just need a fast way to check what something weighs before it hits the scale, Carats gets out of your way and gives you the answer. Enter three measurements, pick your stone and cut style, and the estimated carat weight is right there. No loading screens. No sign-ins. No nonsense. Carat weight conversion, wire gauge reference, and a solid set of area, distance, and volume converters that come up constantly in a jewelry or metalsmithing workflow. Carats * Carats Weight (Grams / Carats / Points / Milligrams) * Carats Size (Based on Girdle Length, Girdle Width, Depth, Stone type and Facet Style) Gauge Thickness Converter * Area Converter (Square Inches to/from Square Centimeters) * Distance Converter (Inches to/from Centimeters) Facet Styles (Listed in alphabetical order) :: Cabochon Cut, Emerald Cut Faceted, Marquise Cut Faceted, Oval Faceted, Pear Cut Faceted, Rectangular Cushions, Rectangular Faceted, Rectangular Step Cut, Round Faceted, Square Cushions, Square Cut Faceted, and Square Step Cut. Gemstone Types (Listed in alphabetical order) :: Achorite, Agate, Alexandrite, Almandine, Almandine Spinel, Almandine-Spessartine, Amazonite, Amethyst, Andradite, Aquamarine, Balas Ruby, Black Opal, Bloodstone, Brazilian Emerald, Cairngorm, Carnelian, Cat's Eye, Chalcedony, Chlorspinel, Chrome Pyrope, Chrysoberyl, Chrysoprase, Citrine, Color-Change Garnet, Demantoid, Diamond, Dravite, Emerald, Feldspar, Fire Opal, Garnet, Ghanospinel, Goshenite, Green Quartz, Grossular, Heliodore, Heliotrope, Hessonite, Hyacinth, Indicolite, Jade, Jadeite, Jargon, Jasper, Labradorite, Lapis Lazuli, Malaia, Matura Diamond, Moonstone, Morganite, Morion, Nephrite, Onyx, Opal, Orthoclase, Peridot, Peristerite, Praziolite, Pyrope, Pyrope-Almandine, Pyrope-Spessartine, Quartz, Red Beryl, Rhodolite, Rock Crystal, Rose Quartz, Rubellite, Rubicelle, Ruby, Sapphire, Sapphire Spinel, Siberite, Smoky Quartz, Spessartine, Spinel, Sunstone, Topaz, Topazolite, Tourmaline, Tsavorite, Turquoise, Uvarovite, Verdilite, Water Opal, White Opal, and Zircon This app features: • Send your calculations or conversions by email or share sheet • Universal App • All iPhone screens are supported • Fast app switching • Automatically Saves Your Inputs • Latest version of iOS is supported No network connectivity required. Note: All information in this app is for informational purposes only. ## Key features - Carat weight calculation - Gemstone size determination - Gauge thickness converter - Area and distance conversion - Supports various facet styles - Extensive gemstone type database - Email calculation results ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/carats-gem-weight-and-jewelry/id429201473/reviews.md ### 1/5 — Update problem *2026-06-02* The update screwed the estimations ### 5/5 — Very accurate and quick *2018-07-25* The different shapes for cuts and their estimates are helpful especially since it doesn’t need a network connection ### 5/5 — Thumbs up *2014-02-20* I'm no expert so I can't speak to it's accuracy. But it is definitely consistent and very easy to use. Helpful for my eBay postings! ### 5/5 — Great! *2013-04-20* Works fine for round cut calc on the go but seems to under-carat marquise diamonds by about .05 ### 4/5 — Very handy app! *2012-09-10* I use this constantly, and it's pretty accurate! I wish there were more stones to choose from, or a pro version for guys in the gemstones industry like me that would give the species alone as an option. Also, more stone cuts would be nice too, or different variations on cuts, like proportions above and below the girdle, double sided instead of single sided cabs an cushions, or even the ability to put in the measurements of your own unique cuts and save them for later. ### 4/5 — Good ap to have when in doubt *2012-03-19* Works well with round diamonds ## Frequently asked questions about Carats ### How do I calculate carats with Carats Thickness,Weight,Shape? To calculate carats, you simply need to enter the dimensions of your gemstone, including its width, length, and depth. The app will then provide an instant calculation of its carat weight based on these inputs and the selected stone type and facet style. ### What types of gemstones can I calculate carats for? Carats Thickness,Weight,Shape supports a vast array of gemstone types, including Diamond, Emerald, Sapphire, Ruby, Amethyst, Citrine, and many more. The comprehensive list is available within the app's features. ### Does Carats Thickness,Weight,Shape offer any conversion tools? Yes, the app includes a Gauge Thickness Converter, which allows for conversions between Square Inches and Square Centimeters (Area Converter), and Inches and Centimeters (Distance Converter). ### Can I share my calculations from Carats Thickness,Weight,Shape? Absolutely. The app allows you to send your calculations or conversions directly via email, making it easy to share important appraisal information with clients or colleagues. ### What devices is Carats Thickness,Weight,Shape compatible with? Carats Thickness,Weight,Shape is a Universal App, meaning it is compatible with iPhone, iPod Touch, and iPad devices, ensuring a consistent experience across your Apple ecosystem. ### How frequently is Carats Thickness,Weight,Shape updated? The app was last updated on December 14, 2022, with version 7.5. This indicates regular maintenance and potential feature additions to keep the tool current. ### What is the price of Carats Thickness,Weight,Shape? Carats Thickness,Weight,Shape is available for a one-time purchase of $0.99. This provides full access to all its calculation and conversion features. ### Is Carats Thickness,Weight,Shape suitable for beginners? Yes, the app is designed with a user-friendly interface and simple input methods, making it accessible for both professionals and individuals new to gemstone appraisal. ## Version history (last 5 releases) ### 8.1 — 2026-05-09 This release is a full rebuild. The original Carats has been rewritten from scratch, and the result is faster, cleaner, and more capable than the version it replaces and while keeping the classic layout intact for anyone who doesn't want anything to change. Here's what's different. **MODERN GEM WEIGHT ESTIMATOR** The new Gem Weight Estimator (Modern) is a redesigned version of the original estimation tool built for how people actually use the app. The classic estimator is still here and unchanged and the new one runs alongside it. Key differences in the modern layout: - Live search field for the gemstone list and start typing "ruby" or "opal" and the list filters as you go, no more scrolling through 80+ entries to find what you need - Facet style shown in a horizontal scrollable row instead of a dropdown menu - Estimate, gemstone, and specific gravity always visible in the header card while you work - Same formula, same database, different interface and pick whichever one you prefer **FULL APP REDESIGN** - New home screen organizes all calculators into labeled sections: Carats, Gauges, Area, Distance, Volume, and Reference - Section icons and color accents make it easy to see at a glance what category you're in - Cards use a layered glass-style background that works well in both dark and light mode - Smooth gradient background throughout with subtle color glows keyed to each section's accent color - Navigation is faster and tap a calculator, get a result, go back, move to the next one **DARK MODE** Dark mode support has been built in from the ground up. Every screen, every card, every input field responds correctly to the system appearance setting. The dark background is a deep near-black with the section accent colors providing contrast without being hard on the eyes. **PERSISTENT INPUTS** Every input field in the app now saves its value automatically using on-device storage. This was added because it's genuinely annoying to re-enter a measurement you had a minute ago. Close the app mid-calculation and it's still there when you reopen it. Reset buttons are available on every screen when you want to start fresh. **GAUGE GUIDE** The gauge reference chart has been redesigned as a proper scrollable reference table. Gauge 1 through gauge 38 with decimal inch and millimeter equivalents, formatted for quick scanning. It's the kind of thing that used to live as a printed card on the workbench and now it's always in your pocket. **SHARE FROM ANYWHERE** Every calculator in the app now has a Share button. Tap it and a formatted summary of the current inputs and results goes out via the standard iOS share sheet and text, email, AirDrop, Notes, whatever you need. The gem weight estimator share includes the stone name, specific gravity, facet factor, all three measurements, and the estimated carat weight in a clean readable format. **RANDOMIZE** The Randomize button generates believable sample values across all three dimensions and picks a random gemstone and facet combination. It's useful for demonstrating the estimator to a customer or student, or for sanity-checking a formula result against a known stone type. **PERFORMANCE AND RELIABILITY** - All calculators are built on a shared model layer with consistent formatting, rounding, and locale-aware number handling - Number input parsing handles locale decimal separators correctly and comma vs. period depending on your region - Output rows show a clean "Out of range" label if a calculation produces an invalid result rather than crashing or showing garbage - Inputs are validated at the boundaries and negative values are clamped to zero, out-of-range gemstone or facet indices fall back safely **WHAT HASN'T CHANGED** The formula is the same. The gemstone database is the same. The classic layout is the same. If you were using the original app and it worked for you, it still works exactly the way it did. What is new is additive. ### 8.0 — 2026-05-06 This release is a full rebuild. The original Carats has been rewritten from scratch, and the result is faster, cleaner, and more capable than the version it replaces and while keeping the classic layout intact for anyone who doesn't want anything to change. Here's what's different. **MODERN GEM WEIGHT ESTIMATOR** The new Gem Weight Estimator (Modern) is a redesigned version of the original estimation tool built for how people actually use the app. The classic estimator is still here and unchanged and the new one runs alongside it. Key differences in the modern layout: - Live search field for the gemstone list and start typing "ruby" or "opal" and the list filters as you go, no more scrolling through 80+ entries to find what you need - Facet style shown in a horizontal scrollable row instead of a dropdown menu - Estimate, gemstone, and specific gravity always visible in the header card while you work - Same formula, same database, different interface and pick whichever one you prefer **FULL APP REDESIGN** - New home screen organizes all calculators into labeled sections: Carats, Gauges, Area, Distance, Volume, and Reference - Section icons and color accents make it easy to see at a glance what category you're in - Cards use a layered glass-style background that works well in both dark and light mode - Smooth gradient background throughout with subtle color glows keyed to each section's accent color - Navigation is faster and tap a calculator, get a result, go back, move to the next one **DARK MODE** Dark mode support has been built in from the ground up. Every screen, every card, every input field responds correctly to the system appearance setting. The dark background is a deep near-black with the section accent colors providing contrast without being hard on the eyes. **PERSISTENT INPUTS** Every input field in the app now saves its value automatically using on-device storage. This was added because it's genuinely annoying to re-enter a measurement you had a minute ago. Close the app mid-calculation and it's still there when you reopen it. Reset buttons are available on every screen when you want to start fresh. **GAUGE GUIDE** The gauge reference chart has been redesigned as a proper scrollable reference table. Gauge 1 through gauge 38 with decimal inch and millimeter equivalents, formatted for quick scanning. It's the kind of thing that used to live as a printed card on the workbench and now it's always in your pocket. **SHARE FROM ANYWHERE** Every calculator in the app now has a Share button. Tap it and a formatted summary of the current inputs and results goes out via the standard iOS share sheet and text, email, AirDrop, Notes, whatever you need. The gem weight estimator share includes the stone name, specific gravity, facet factor, all three measurements, and the estimated carat weight in a clean readable format. **RANDOMIZE** The Randomize button generates believable sample values across all three dimensions and picks a random gemstone and facet combination. It's useful for demonstrating the estimator to a customer or student, or for sanity-checking a formula result against a known stone type. **PERFORMANCE AND RELIABILITY** - All calculators are built on a shared model layer with consistent formatting, rounding, and locale-aware number handling - Number input parsing handles locale decimal separators correctly and comma vs. period depending on your region - Output rows show a clean "Out of range" label if a calculation produces an invalid result rather than crashing or showing garbage - Inputs are validated at the boundaries and negative values are clamped to zero, out-of-range gemstone or facet indices fall back safely **WHAT HASN'T CHANGED** The formula is the same. The gemstone database is the same. The classic layout is the same. If you were using the original app and it worked for you, it still works exactly the way it did. What is new is additive. ### 7.5 — 2022-12-14 Bug Fixes ### 7.4 — 2018-07-25 This app has been updated by Apple to display the Apple Watch app icon. Bug fixes to prevent crashing ### 7.3 — 2015-02-23 Updated for iOS 8 Support for iPhone 6 and 6+ screen sizes ## More apps by Verosocial Studio - [Heat Index & Category Computer](https://appshunter.io/ios/app/heat-index-and-category-computer/id370913314) - [Wind Chill, Snow Day Pro](https://appshunter.io/ios/app/wind-chill-snow-day-pro/id372283970) - [LSI Water Service Logbook/Plan](https://appshunter.io/ios/app/lsi-water-service-logbookplan/id373769371) - [Roadtrip: Fuel & Trip Planner](https://appshunter.io/ios/app/roadtrip-fuel-and-trip-planner/id377000731) - [Torque Calculator, Units Conv](https://appshunter.io/ios/app/torque-calculator-units-conv/id379959718) - [Gas Oil Mixture Ratio](https://appshunter.io/ios/app/gas-oil-mixture-ratio/id380750809) All apps by Verosocial Studio: https://appshunter.io/developer/354566841 ## Related topics [gemstone weight](https://appshunter.io/ios/topics/gemstone-weight) --- *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 2026-08-21.*