Free Jewelry & Diamond Tools: Calculators, Charts, Guides
Diamond & Sapphire offers twenty free jewelry and diamond tools, including an engagement ring budget calculator, a diamond size chart, a lab-grown vs natural diamond comparator and a scrap gold calculator. They are interactive charts, calculators and guides for diamond size, grading and ring size; gemstones and birthstones; jewelry metals and care; and ring costs, diamond certificates and jewelry terms. Every tool works in your browser with no account needed, and each one is free to link to and cite.
All Free Jewelry and Diamond Tools
Ordered by how much each tool helps when you are choosing, sizing and caring for fine jewelry.
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Calculator
Engagement Ring Budget Calculator
Enter a budget to see how it splits between center stone, setting and accents, the carat a lab-grown or natural diamond could reach at retail prices, and our rings priced closest to it.
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Interactive chart
Diamond Size Chart
Carat-to-millimeter sizes for 10 diamond shapes from 0.25 to 5 carats, with an mm-to-carat converter and a true-to-scale view on a hand.
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Converter
Ring Size Chart
Convert US, UK, European and Japanese ring sizes, measure at home from a ring or your finger, and print a ring sizer.
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Quiz
Engagement Ring Quiz
Eight quick questions match you to one of six engagement ring styles, with a setting, shape, center stone and metal, plus real rings from our collection.
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Comparison tool
Lab-Grown vs Natural Diamond Comparator
Compare lab-grown and natural diamonds from 0.5 to 5 carats on 2026 retail price, face-up size, resale value and how each is identified.
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Grading chart
Diamond Clarity Chart and Color Scale
The full diamond grading scale: clarity from FL to I3, color from D to Z and cut grades, plus how GIA, IGI and AGS compare.
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Interactive guide
How to Read a GIA Certificate
Click through four sample grading reports, natural and lab-grown, GIA and IGI, field by field, then check any report's measurements with the decoder.
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Comparison tool
White Gold vs Platinum
Compare white gold, platinum and six other jewelry metals on durability, purity, weight, upkeep, skin sensitivity and relative cost.
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Data map
Average Engagement Ring Cost by State
Estimated engagement ring spending in all 50 states and DC on a shaded map, with a full ranking, the five-year trend and free data.
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Color chart
Sapphire Color Chart
Every sapphire color, from royal and cornflower blue to padparadscha, teal and pink, with what causes each color and how it is graded.
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Interactive wheel
Birthstones by Month
Turn the birthstone wheel to see each month's gemstone, from January garnet to December turquoise and tanzanite, with its color, meaning and hardness.
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Year-by-year guide
Anniversary Gemstones by Year
Pick any wedding anniversary year to see its traditional gemstone, what it means and thoughtful ways to give it.
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Care guide
How to Clean Jewelry
Choose your piece, metal and gemstone for a tailored at-home cleaning routine: what is safe, what to avoid and when to see a jeweler.
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Interactive scale
Mohs Hardness Scale for Gemstones
See where every gemstone ranks from 1 to 10, compare two stones and learn which are tough enough to wear every day.
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Glossary
Jewelry Terms Glossary
More than 250 jewelry terms in plain English, from the 4Cs and carat vs karat to settings and chains, plus what 925, 585 and 750 stamps mean.
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Gallery
Princess Diana's Engagement Ring and Celebrity Sapphire Rings
Princess Diana's 12-carat Ceylon sapphire, now worn by Catherine, Princess of Wales, and seven more celebrity and royal sapphire rings, illustrated and sourced.
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Interactive map
Sapphire Origin Map
Map the world's sapphire sources, from Kashmir, Burma and Sri Lanka to Madagascar and Montana, compared by color, geology, treatment and value.
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Calculator
Scrap Gold Calculator
Enter weight and karat for melt value and typical scrap offers at the latest gold price, plus resale, fair market and insurance values. Estimates only, not appraisals.
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Daily price table
Gold Price Per Gram Today
Today's gold price per gram for 24K, 22K, 18K, 14K and 10K, plus per ounce and pennyweight, and silver and platinum per gram, updated each US trading day.
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Daily price table
14K Gold Price Per Gram
Today's 14K gold value per gram, pennyweight and ounce, a grams-to-dollars table, typical scrap offers and a 30-day chart.
Free Jewelry Tools FAQ
Are these jewelry tools free to use?
Yes. Every tool on this page is free and works in your browser, with no account needed. Use them as often as you like.
Can I link to or cite these tools?
Yes. Writers, editors, teachers and bloggers are welcome to link to this page or to any individual tool. Copy the citation or link code below; most tool pages also include their own citation box.
Where does the information come from?
Each tool explains its method and lists its sources on its own page. Several of them, including the diamond grading, anniversary gemstone and sapphire guides, draw on references from the Gemological Institute of America (GIA).
Are the results measurements, appraisals or quotes?
No. The tools are educational. Sizes, grades and comparisons describe typical stones and published standards, and an individual piece can differ. Confirm the details of a specific stone on its grading report or with a qualified appraiser.
How often are new tools added?
We add and update tools through the year. This page lists every tool as soon as it goes live, so it is the one link to bookmark or share.
Cite or Link to This Page
Writing about diamonds, engagement rings or gemstones? One link gives your readers every tool on this page.
Cite this page
Free to reference with a link to Diamond & Sapphire.
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