Comparison

DiamondMaster vs Lapuma Fuel

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

DiamondMaster

This app provides wholesale diamond pricing and market analysis for professionals. It compares mined and lab-grown diamonds across multiple grading systems and currencies, offering insights into value appreciation and depreciation.

Highlights
  • Compares mined and lab-grown diamonds
  • Wholesale value comparisons
  • 13 mediums of exchange and 8 C's
  • 4 grading systems displayed simultaneously
  • Dimension guidelines for shapes and carat weights
  • Tracks value appreciation/depreciation
  • Global price adjuster
Features
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ONE DIAMOND. TWENTY-SEVEN WAYS TO MEASURE ITS VALUE. What changes when you measure a diamond in gold instead of dollars? Or Bitcoin instead of Swiss francs? DiamondMaster helps diamond professionals, gemologists, appraisers, buyers and traders explore wholesale reference values for Mined-Natural and Grown-Created diamonds. Compare classifications, adjust your pricing basis, and see how a different exchange unit changes the picture. Developed by Wayne D. Prentice, Graduate Gemologist and former GIA Resident Gemology Instructor, DiamondMaster brings gemological knowledge and the BrightList wholesale reference guide together on iPhone and iPad. EXPLORE THE 8 C'S Cut Shape, Carat, Color, Clarity, Cut Grade, Cost, Change in Value and Creationβ€”the diamond's natural or laboratory-grown origin. β€’ 10 shapes: Round, Pear, Emerald, Princess, Marquise, Oval, Radiant, Cushion, Trilliant and Heart. β€’ Shape-specific carat selections, with 46 categories for Round, from 0.01 ct through the 10–10.99 ct range. β€’ 10 color grades, D–M, and 10 clarity grades, IF–I-3. β€’ Five cut-grade selections, Excellent through Poor. β€’ Separate natural and lab-grown reference datasets. β€’ Per-carat and total reference values, dimension guidelines, grading descriptions and shape-specific gemological information. 27 COST UNITS WITH BRIGHTLIST Keep the diamond selection. Change the measuring stick. 12 currencies: USD, EUR, JPY, CHF, CAD, GBP, AUD, BRL, RUB, INR, CNY and ZAR. 2 basket references: β€’ XDR: the IMF's Special Drawing Right. β€’ XUNT: DiamondMaster's calculated reference for the proposed gold-and-currency BRICS+ "THE UNIT" basket. 6 precious-metal units: β€’ Gold (XAU), platinum (XPT) and silver (XAG), each by troy ounce. β€’ Gold by gram: Denari (XDEN). β€’ Gold by 100 grams: Centum (XCEN). β€’ Gold by kilogram: Milia (XMIL). 7 crypto assets: Bitcoin (BTC), Ethereum (ETH), Litecoin (LTC), Cardano (ADA), Solana (SOL), PAX Gold (PAXG) and Zcash (ZEC). COMPARE ACROSS TIME Natural-diamond screens show 1-year and 5-year percentage changes in your selected Cost unit. By liberating diamond valuation from the traditional US Dollar peg, the 'Bright List' normalizes a diamond's intrinsic scarcity, extraction costs, and luxury premium across 27 distinct economic units. Whether you are tracking a gem by its 4 C’s or analyzing macro liquidity shifts, our advanced dual-period tracking over 1- and 5-year intervals reveals the true reality of wealth: letting you see instantly whether your diamond is genuinely appreciating, or if your chosen currency is losing its purchasing power. MAKE THE LIST YOUR OWN Use the Global Value Adjuster to apply a discount or premium across diamond calculations. Explore your preferred buying or selling basis, or return to LIST with a 1.00 multiplier. DEMO AND SUBSCRIBER ACCESS Without an active subscription, explore the calculators using older demonstration data and a smaller Cost-unit selection. A BrightList subscription unlocks subscriber diamond reference datasets and all 27 Cost units. Exchange data refreshes on a daily cycle when connectivity and source data allow. Values may use earlier saved or supplied data; this is not a continuous trading feed. SUBSCRIPTIONS Choose from 7-day, 1-month, 6-month or 1-year auto-renewing plans. Current prices and terms appear in the app before purchase. Payment is charged to your Apple Account at confirmation. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. Renewal is charged within the preceding 24 hours. Manage or cancel in Apple Account settings. Use Restore Subscription to check existing access. Reference values are not individual appraisals, purchase offers or guaranteed resale prices. DiamondMaster does not execute trades. Privacy Policy: https://www.diamondmaster.net/privacy_policy.php Terms of Use: https://www.diamondmaster.net/terms_of_use.php

About

Lapuma Fuel

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Buying your heating oil has never been more fun The Lapuma Fuel App gives you the power to order oil from the palm of your hand. We want you to have the same great experience with our online system that you get elsewhere in your life. Easy, convenient, smart. Our app and ecommerce platform are designed to fit your busy schedule. Have access to us anywhere, anytime, and from any device. Get price quotes, delivery status notifications, and money saving promotions. All without any phone calls or hassles. From the app, you can: - Check our great daily prices - Decide how many gallons you need - Place your order - Edit your profile - Contact us by email - Reach our full web site Download the app today and join the growing community of customers who are bringing the oil business into the digital age!

Screenshots

DiamondMaster4 screens
Lapuma Fuel4 screens

Verdict

The call

The clearest difference is in-app purchases: Lapuma Fuel at none against DiamondMaster's 4. Lapuma Fuel also leads on iOS requirement (10.0 vs 16.4). DiamondMaster's advantage is update cadence (every 5 weeks vs every 13 months). On price, ads and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. DiamondMaster sells 4 in-app purchases, starting at $6.99 per 7 days. Lapuma Fuel asks for nothing beyond the download.

UpkeepUpdate frequency

DiamondMaster ships an update every 5 weeks, Lapuma Fuel every 13 months. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

Scorecard3 real differences Β· 5 level
DiamondMaster versus Lapuma Fuel: the parameters behind the verdict, then further details
ParameterDiamondMasterLapuma Fuel
PriceFreeFree
Positive reviews75.0% of reviewsβ€”
Update frequencyEvery 5 weeks β€” betterEvery 13 months
AdsNoNo
In-app purchasesYesNo β€” better
MonetizationFree with in-app purchasesβ€”
DevicesiPhone, iPadiPhone, iPad, iPod β€” better
Requires iOS16.410.0 β€” better
Further details β€” not scored
Size23 MB9 MB
Age rating4+4+
DeveloperWayne D. Prentice, G.G.Energy Engine LLC

In-app purchases

4 purchases

DiamondMaster

Subscriptions4
  • Wholesale "Bright List" 1 wk.$6.997 Days
  • Wholesale "Bright List" 1 mo.$24.991 Month
  • Wholesale "Bright List" 6 mo.$109.996 Months
Show 1 more
  • Wholesale "Bright List" 1 yr.$199.991 Year
None

Lapuma Fuel

No in-app purchases

Questions

Is DiamondMaster free?
DiamondMaster is free to download, with in-app purchases available.
Is Lapuma Fuel free?
Lapuma Fuel is free to download, with no in-app purchases.
Do DiamondMaster or Lapuma Fuel have ads?
Neither DiamondMaster nor Lapuma Fuel shows ads.
Which is updated more often, DiamondMaster or Lapuma Fuel?
DiamondMaster ships an update every 5 weeks, and Lapuma Fuel every 13 months. Most recently, DiamondMaster was updated on October 23, 2026 and Lapuma Fuel on October 25, 2026.

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