Carats: Gemstone Calculator9.1 - App Store

Thank you for using Carats. Your care with every stone and measurement deserves tools that make the work easier. For jewelers, gemstone collectors and lapidary enthusiasts, Carats brings gem weight estimates, conversions and sales records to iPhone and iPad, with useful tools on Apple Watch.

GEMSTONE WEIGHT ESTIMATES

- Choose from 118 gemstone and material entries.
- Find diamond, ruby, sapphire, emerald, tanzanite and more.
- Enter length, width and depth in millimeters.
- Select a cut and review its reference factor.
- Account for girdle, pavilion and outline proportions.
- See estimated carats as measurements change.
- Save your estimate and illustrated preview with Carats Pro.

ADVANCED GEM AND CUSTOM CUTS

- Measure above, through and below the girdle separately.
- Choose brilliant, step, princess, Asscher, baguette and radiant cuts.
- Explore brilliant and step cushion cut options.
- Describe single or double sided cabochons and cushions.
- Enter table and culet dimensions and a cushion corner radius.
- Adjust the upper and lower profiles independently.
- Give a unique custom cut a name and measured outline area.
- Enter custom volume factors or directly measured volume.
- Add species, specific gravity and measurement notes.
- Save an Advanced Gem with Carats Pro.

CONVERSIONS FOR YOUR JEWELRY BENCH

- Convert carats, grams, points and milligrams.
- Compare wire gauge sizes in inches and millimeters.
- Convert mils, micrometers, millimeters, centimeters and inches.
- Work with square inches, centimeters, feet, yards and meters.
- Convert US gallons, Imperial gallons and liters.
- Compare cubic inches, centimeters, feet, yards and meters.
- Explore graphs to see how changing a value affects a result.

APPLE WATCH TOOLS

- Explore the separate Carats app for Apple Watch.
- Convert weight at your wrist.
- Calculate gauge sizes and browse the gauge guide.
- Consult gemstone density and cut factor charts.
- View calculator graphs and share results.
- Use every Watch tool without a usage limit or subscription.
- Calculate without an iPhone companion or a saved history.

SALES AND CUSTOMERS

Keep gemstone sale details together with Carats Pro.

- Record gemstone names, carat weights, prices, currencies and dates.
- Save unfinished sales as drafts.
- Link a sale to a saved calculation and assign a customer.
- Choose a percentage or fixed commission.
- Track pending and earned commissions.
- Record partial payments and review remaining balances.
- Keep commission adjustments and payment history.
- Add customers or import selected details from Contacts.

GEMSTONE STATISTICS

- Review Regular Gems, Advanced Gems and Combined Gems separately.
- Compare saved gem counts, total estimated weight, averages and ranges.
- Browse gemstone, species, cut and monthly activity charts.
- Open records to review measurements and linked sale counts.
- Explore sale weights, revenue and price per carat.
- Compare sales by month, quarter or year, with currencies kept separate.

KEEP YOUR WORK TOGETHER

- Search calculator sections.
- Open Help, Share, Reset and Randomize from the calculator menu.
- Save records locally on iPhone or iPad.
- Share results and export CSV files for a spreadsheet.
- Back up customers, calculations and sales in JSON.
- Reuse saved advanced measurements.

Carats Pro is required to save or edit calculations, add or edit sales, and import records. Choose monthly access or a one-time lifetime purchase. Monthly access renews automatically until canceled. Viewing, sharing and exporting existing records remain available without Pro.

For monthly subscriptions:
Monthly Pro is a 1-month auto-renewable subscription.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Gemstone weights are estimates based on measurements, density and cut. Use a scale for actual weight.

Version History You bring care and a good eye to every stone. Thank you for using Carats for your work and collection. This update gives you more gemstone choices, detailed custom cut measurements and a separate, standalone Apple Watch app.

CARATS ON APPLE WATCH

- Convert carats, grams, points and milligrams at your wrist.
- Use Gauge Sizes to compare inches, millimeters and gauge.
- Open Gauge Guide for a thickness reference.
- Browse gemstone specific gravity and cut factor charts.
- Explore calculator graphs and share results.
- Use all Watch tools without a usage limit or subscription.
- Calculate without an iPhone companion or a saved history.

MORE GEMSTONES AND SPECIES

- Choose from 118 gemstone and material entries.
- Find tanzanite, kunzite, hiddenite, iolite, amber and ametrine.
- Select species including beryl, corundum, spodumene and zoisite.
- Filter the picker by All, Gem varieties or Species.
- Search names, species and specific gravity.
- See species beside gemstone varieties.

MORE CUT CHOICES

- Try Asscher, baguette, princess and radiant cut options.
- Compare brilliant cushion and step cushion variations.
- Use reference cut factors for a standard weight estimate.
- Open Advanced Gem when you want to describe the stone's proportions.
- Choose single or double sided cabochons, including cushion shapes.

A NEW ADVANCED GEM VIEW

- Enter length and width in millimeters.
- Measure height above the girdle, girdle thickness and depth below it.
- Choose a faceted taper, dome, straight sides or a custom volume factor.
- Set upper and lower profiles separately.
- Add table and culet dimensions.
- Describe a cushion outline with its corner radius.
- Review total depth, outline area, estimated volume and carat weight.
- See how the depth is divided above, at and below the girdle.

MEASURE YOUR OWN CUSTOM CUT

- Name an unusual cut and choose the outline that fits.
- Enter a measured outline area for a unique shape.
- Use a directly measured volume when you have one.
- Add a custom gemstone or material name, species and density.
- Keep notes on your measurement method.
- Adjust taper fullness to describe the profile you are estimating.

SAVE AND REVISIT ADVANCED GEMS

- Save an Advanced Gem with Carats Pro.
- Keep its cut, species, density, dimensions and custom measurements together.
- Open a record to review those details and linked sale counts.
- Reuse the measurements to start another estimate.
- Edit the saved title or notes without replacing the original measurements.
- Keep advanced gem details in JSON backups and calculation CSV exports.
- Continue viewing, sharing and exporting existing records without Pro.

THREE WAYS TO REVIEW YOUR GEMS

- Regular Gems shows your saved standard estimates.
- Advanced Gems shows detailed measurements and custom cuts.
- Combined Gems brings both groups into an overview.
- Compare gem counts, estimated carats, average weight and weight ranges.
- Explore gemstone, species and cut charts.
- Follow monthly gemstone activity and open the records behind an overview.

CALCULATORS THAT ARE EASIER TO FIND

- Browse calculator sections with familiar titles and descriptions.
- Search for the tool you need.
- Find Help, Share, Reset and Randomize in the top right menu.
- Read usage help written for the calculator you have open.
- Try an example with Randomize or restore starting values with Reset.
- Open Advanced Gem from its link below the Gem Estimator.
- Explore graphs to compare inputs and outputs.

Carats Pro is required to save or edit calculations, add or edit sales, and import records on iPhone or iPad. Choose monthly or lifetime access. Gem weights remain estimates, so use a scale for actual weight. 9.1 1d ago Your attention to detail is one of your key tools. Thank you for using Carats and making it part of your gemstone and jewelry work. This update brings more ways to describe a stone, manage a sale, and keep the customer details that matter.

MORE DETAIL IN GEM WEIGHT ESTIMATES

- Enter length, width, and depth in millimeters.
- Search for a gemstone and select its cut.
- Add optional adjustments for girdle thickness.
- Account for pavilion bulge where appropriate.
- Choose shape observations that apply to the selected cut.
- Read the guidance beside each adjustment.
- Review the total adjustment with your estimate.
- Save a gemstone preview with a calculation using Carats Pro.

The preview gives your saved result a visual reference. Weight estimates remain approximate, so use a scale when you need the stone's measured carat weight.

CUSTOMERS CONNECTED TO YOUR SALES

- Add a customer directly in Carats.
- Import selected customer details from Contacts.
- Save an address and your customer notes.
- Choose a customer while creating or editing a sale.
- Open a customer to see associated sales.
- Open their saved address in Maps.
- Import contact updates when you choose.
- Keep your customer notes when importing updated details.

Removing a customer assignment leaves the sale in place. Your saved customer details stay under your control.

COMMISSIONS AND PAYMENT HISTORY

- Choose a percentage or fixed commission.
- Save a commission as pending or earned.
- Mark a pending commission earned when it becomes due.
- Record a full or partial payment.
- See unpaid balances and payments received this month.
- Adjust a commission and include the reason.
- Reverse a recorded payment while keeping the original entry.
- Review overpayments separately.
- Cancel a sale while keeping its activity history.

Paid and unpaid status follows the remaining commission balance. Amounts stay grouped by currency, so you can review each currency on its own.

SALES AND STATISTICS IN ONE ROUTINE

- Start from dedicated Calculators, Sales, Statistics, and More tabs.
- Browse calculator categories or search for a tool.
- Use the calculator sidebar and detail area on iPad.
- Filter saved sales by status.
- Compare sales activity by month, quarter, or year.
- Browse saved calculations from Statistics.
- Review monthly activity and completed sale weights.
- Compare gemstone and calculator frequency.
- Explore revenue and pricing charts by currency.
- Read chart values in a list.

Sales Overview includes every sale status. Revenue and weight charts use completed sales, while pending sales, canceled sales, and drafts remain visible in record counts.

BACKUPS THAT KEEP RELATED DETAILS TOGETHER

- Export a JSON backup of customers, calculations, and sales.
- Include customer assignments, notes, and addresses.
- Preserve commission settings and payment activity.
- Keep saved gemstone previews with calculation records.
- Export CSV files for a spreadsheet.
- Import compatible files with Carats Pro.
- Add new records while preserving records already saved.

Choose JSON when restoring customers and their related sales together. File and record limits are shown in Import & Export before you proceed.

CARATS PRO AND EVERYDAY TOOLS

- Choose monthly access or a one-time lifetime purchase.
- Restore eligible purchases from the Carats Pro screen.
- Manage monthly subscriptions from the app.
- Keep viewing, sharing, and exporting existing records without Pro.
- Find calculator help, gemstone references, and appearance settings in More.

Saving or editing calculations, adding or editing sales, and importing records require Carats Pro. Monthly access renews automatically until canceled. 8.2 6d ago 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. 8.1 May 9 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 May 6 Bug Fixes 7.5 12/14/2022 Bug fixes to prevent crashing 7.4 07/25/2018 Updated for iOS 8
Support for iPhone 6 and 6+ screen sizes 7.3 02/23/2015 Bug Fixes 7.2 09/15/2014 Bug Fixes
Smaller App Size & Download Size 7.1 01/14/2014 Updated interface to be easier to read for iOS 7 7.0 10/03/2013 Added support for iOS 7 6.2 09/18/2013 Updated Diamond's specific gravity from 3.51 to 3.52
Fixed typos
Updated Icon & Name 6.1 05/09/2013 Added support for the iPhone 5 and iOS 6 6.0 10/22/2012 Updated for Retina Display
Fixed Short Distance Calculation from Nanometers to Micrometers 5.1 05/01/2012 Added calculators for length, volume and area
Fixed typos 5.0 02/23/2012 Updates for iOS 5 4.1 11/15/2011 Updates for iOS 5
Fixed textbox transparency bug in iOS 5
Fixed small memory leaks 4.0 10/22/2011 Added support for international number separators
Fixed Typo's 3.0 09/13/2011 Fixed small memory leaks.
Interface improvements on iPad 2.00 09/08/2011 Bug fix for iPad position of the Carats Weight Calculator labels when rotated display.

Updated buttons for better contrast with the background. 1.01 04/18/2011 1.00 04/13/2011