Doptrace: Faceting Bench

Rough, Tiers, Laps & Yield

$2.99 · Designed for iPad. Not verified for macOS.

New in 2.0: a per-tier cutting log, critical angle and windowing checks, tangent-ratio angle changes, index and cheater maths, and a 41-material library. Doptrace is a faceting bench notebook and calculator for gem cutters. Log every stone from rough to finished, and keep the angle, index positions and lap of every tier next to the maths you need at the machine. STONE LOG - Unlimited stones: material, colour, design and source, index gear, outline and stage (planned, preform, pavilion, transfer, crown, finished) - A cutting sequence for each stone: side, angle, index positions, lap/polish and meetpoint note for every tier, with Cut and Polished ticks and a progress bar - Pavilion tiers are checked against the stone's critical angle and flagged when they would window - Rough and finished weight, yield, loss, cost basis, cost per finished carat and bench hours - Up to six photos per stone, checkpoints with due dates, and a bench journal for laps, polish trials, machine and transfer notes FACETING CALCULATORS - Critical angle from refractive index, the two-bounce pavilion window and a starting pavilion main angle - Tangent-ratio angle transposition: re-cut a design in another material or at another main angle while keeping its meetpoints - Index wheel: symmetric and mirror-image positions for 64, 72, 77, 80, 96 and 120 gears, gear conversion with the cheater offset you need, and cheater in teeth - Weight from size with International Gem Society shape constants and a girdle adjustment - Round brilliant proportions: pavilion depth, crown height, total depth % and weight from angles, table and girdle - Size & yield planner: the largest stone that fits your rough, with expected weight and yield - Yield & cost, carats to grams, millimetres to inches MATERIAL LIBRARY - 41 materials, from quartz, beryl, corundum, spinel, topaz and tourmaline to garnets, collector stones and lab-grown simulants - RI range, birefringence, optic character, SG, hardness, dispersion, critical angle and cutting notes on cleavage, heat sensitivity and orientation - Enter your own measured RI and SG on any stone EXPORT AND BACKUP - PDF cutting sheet for each stone and a bench report - CSV spreadsheet of the stone log - Full backup file with stones, tiers, photos, notes and checkpoints; restore by replacing or merging, with a safety copy saved first PRIVATE BY DESIGN - One purchase. No subscription, no ads, no account - Everything stays on your device; no data is collected - Designed for iPhone and iPad, with dark mode and large text support Doptrace is a bench notebook and calculator. It does not identify gemstones, validate a design, assess treatments or value, or replace qualified lapidary instruction. Wear eye protection and keep laps wet.

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Doptrace 2.0 is rebuilt for faceters: - Stone log with a per-tier cutting sequence: angle, index positions, lap, Cut and Polished ticks - Critical angle, windowing checks and starting pavilion angles - Tangent-ratio angle changes, index wheel, gear conversion and cheater - Weight, round-proportion and size & yield calculators - Library of 41 materials with RI, SG and cutting notes - PDF cutting sheets, bench report, CSV export, backup and restore - System tabs, dark mode, larger text and iPad layouts Your 1.0 records are carried over automatically. The generic reference cards and the sample records shown as your own in 1.0 have been removed.

Version 2.0

The developer, Robert Corbin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    Robert Corbin
    Size
    4.5 MB
    Category
    Lifestyle
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Age Rating
    4+
    Copyright
    © 2026 Robert Corbin
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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