Sources & Research

Transparency & Accuracy

Sources & Research

Every claim on this website is grounded in peer-reviewed science, institutional research, and reputable geological data. This page provides full citations and direct links.

Diamond Formation & Volume Within Earth

  • MIT News (2018) — Sound Waves Reveal Diamond Cache Deep in Earth's Interior.
    Research by Ulrich Faul et al. estimating ~1 quadrillion tons of diamond in Earth's cratonic roots, 90–150 miles below the surface.
    news.mit.edu ↗
  • Geochemistry, Geophysics, Geosystems (2018) — Multidisciplinary constraints on the abundance of diamond and eclogite in the cratonic lithosphere.
    Peer-reviewed journal paper underpinning the MIT findings.
    agupubs.onlinelibrary.wiley.com ↗
  • Oregon State University — Volcano World — Diamonds.
    Explains diamond formation, kimberlite pipes, and gem-quality statistics (only ~35% of kimberlite diamonds are gem quality).
    volcano.oregonstate.edu ↗
  • Earth Sciences — earthsci.org — Diamond Deposits.
    Detailed geological overview of diamond deposit types including kimberlite and lamproite pipes.
    earthsci.org ↗

Diamond Mining Statistics & Production History

  • GIA Gems & Gemology (2007) — Global Rough Diamond Production Since 1870 (A.J.A. Janse).
    Documents ~4.5 billion carats mined from antiquity to 2005, valued at ~US$300 billion.
    gia.edu ↗
  • U.S. Geological Survey (USGS) — Grade-Tonnage and Other Models for Diamond Kimberlite Pipes.
    Provides median diamond size, grade, and quality statistics for kimberlite deposits.
    pubs.usgs.gov ↗
  • GIA Gems & Gemology (2019) — Kimberlites: Earth's Diamond Delivery System.
    Explains the geological process by which diamonds travel from 150–700 km depth to the surface via kimberlite eruptions.
    gia.edu ↗

Diamond Grading Standards (4Cs)

  • GIA (Gemological Institute of America) — The 4Cs of Diamond Quality.
    The world's foremost authority on diamond grading. Established the international diamond grading system.
    gia.edu ↗
  • GIA — Diamond Colour Grading.
    gia.edu/diamond-color ↗
  • GIA — Diamond Clarity Grading.
    gia.edu/diamond-clarity ↗
  • Natural Diamond Council — The 4Cs Explained.
    Industry resource for understanding the international grading system.
    naturaldiamonds.com ↗

Fancy Coloured Diamond Rarity

  • GIA — Fancy Color Diamond Grading.
    Explains colour grading for naturally coloured diamonds. Fancy coloured diamonds represent fewer than 0.1% of gem-quality diamonds.
    gia.edu ↗
  • Smithsonian Institution — National Museum of Natural History — The Hope Diamond.
    Documents one of the world's most famous and historically significant blue diamonds (45.52 carats, Fancy Deep Blue, VS1).
    naturalhistory.si.edu ↗

Swimming Pool Calculation Methodology

  • Volume of all diamonds ever mined: ~5.5 billion carats total (GIA, 2007 figure of 4.5 billion carats to 2005, plus approximately 130 million carats per year to 2025). At 0.2 grams per carat and a density of 3.51 g/cm³, this equals approximately 313 cubic metres.
    An Olympic swimming pool (FINA standard: 50m × 25m × 2m) holds 2,500 m³ — meaning all mined diamonds would fill 12.5% of the pool.
  • FINA (World Aquatics) — Competition Pool Standards.
    Olympic pools are 50m × 25m × minimum 2m = 2,500 m³ volume.

Additional Academic & Institutional References

A note on statistics: Diamond industry data is complex and not always centrally tracked. Figures presented on this site represent best estimates from multiple authoritative sources. Where ranges exist, we present the most widely cited mid-point values. Our rarity calculator uses statistical modelling based on GIA grading distribution data and known production figures. It is intended as an educational and illustrative tool, not a valuation instrument.

We do not source information from any government, institution, or publication associated with political bias, and have specifically excluded any sources that may present commercially motivated data without independent verification.