{
  "schemaVersion": 1,
  "version": "1.0.0",
  "published": "2026-09-03",
  "name": "Facet Approximate Diamond Face-Up Size Reference",
  "creator": "Stienhardt",
  "contact": "jgalperin@stienhardt.com",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "canonicalUrl": "https://jacobiusmakes.github.io/facet-diamond-tool/dataset.html",
  "method": "Cube-root scaling from one-carat face-up anchors: round 6.5 x 6.5 mm, oval 8.0 x 5.5 mm, emerald 7.0 x 5.0 mm, and Dutch Marquise 9.4 x 5.1 mm (scaled to 1 carat from a certified reference stone, IGI report LG799689559, 9.49 x 5.15 mm at 1.03 ct).",
  "limitations": "Illustrative estimates based on typical proportions, not observations of individual diamonds. Always use the exact measurements on the grading report.",
  "fields": [
    "shape_slug",
    "shape_label",
    "carat_weight",
    "approximate_length_mm",
    "approximate_width_mm",
    "facet_url"
  ],
  "rows": [
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 1,
      "approximate_length_mm": 6.5,
      "approximate_width_mm": 6.5,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=1.00"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 1.1,
      "approximate_length_mm": 6.71,
      "approximate_width_mm": 6.71,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=1.10"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 1.2,
      "approximate_length_mm": 6.91,
      "approximate_width_mm": 6.91,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=1.20"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 1.3,
      "approximate_length_mm": 7.09,
      "approximate_width_mm": 7.09,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=1.30"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 1.4,
      "approximate_length_mm": 7.27,
      "approximate_width_mm": 7.27,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=1.40"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 1.5,
      "approximate_length_mm": 7.44,
      "approximate_width_mm": 7.44,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=1.50"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 1.6,
      "approximate_length_mm": 7.6,
      "approximate_width_mm": 7.6,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=1.60"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 1.7,
      "approximate_length_mm": 7.76,
      "approximate_width_mm": 7.76,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=1.70"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 1.8,
      "approximate_length_mm": 7.91,
      "approximate_width_mm": 7.91,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=1.80"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 1.9,
      "approximate_length_mm": 8.05,
      "approximate_width_mm": 8.05,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=1.90"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 2,
      "approximate_length_mm": 8.19,
      "approximate_width_mm": 8.19,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=2.00"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 2.1,
      "approximate_length_mm": 8.32,
      "approximate_width_mm": 8.32,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=2.10"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 2.2,
      "approximate_length_mm": 8.45,
      "approximate_width_mm": 8.45,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=2.20"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 2.3,
      "approximate_length_mm": 8.58,
      "approximate_width_mm": 8.58,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=2.30"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 2.4,
      "approximate_length_mm": 8.7,
      "approximate_width_mm": 8.7,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=2.40"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 2.5,
      "approximate_length_mm": 8.82,
      "approximate_width_mm": 8.82,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=2.50"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 2.6,
      "approximate_length_mm": 8.94,
      "approximate_width_mm": 8.94,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=2.60"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 2.7,
      "approximate_length_mm": 9.05,
      "approximate_width_mm": 9.05,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=2.70"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 2.8,
      "approximate_length_mm": 9.16,
      "approximate_width_mm": 9.16,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=2.80"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 2.9,
      "approximate_length_mm": 9.27,
      "approximate_width_mm": 9.27,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=2.90"
    },
    {
      "shape_slug": "round",
      "shape_label": "Round",
      "carat_weight": 3,
      "approximate_length_mm": 9.37,
      "approximate_width_mm": 9.37,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=round&carat=3.00"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 1,
      "approximate_length_mm": 8,
      "approximate_width_mm": 5.5,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=1.00"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 1.1,
      "approximate_length_mm": 8.26,
      "approximate_width_mm": 5.68,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=1.10"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 1.2,
      "approximate_length_mm": 8.5,
      "approximate_width_mm": 5.84,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=1.20"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 1.3,
      "approximate_length_mm": 8.73,
      "approximate_width_mm": 6,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=1.30"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 1.4,
      "approximate_length_mm": 8.95,
      "approximate_width_mm": 6.15,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=1.40"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 1.5,
      "approximate_length_mm": 9.16,
      "approximate_width_mm": 6.3,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=1.50"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 1.6,
      "approximate_length_mm": 9.36,
      "approximate_width_mm": 6.43,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=1.60"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 1.7,
      "approximate_length_mm": 9.55,
      "approximate_width_mm": 6.56,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=1.70"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 1.8,
      "approximate_length_mm": 9.73,
      "approximate_width_mm": 6.69,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=1.80"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 1.9,
      "approximate_length_mm": 9.91,
      "approximate_width_mm": 6.81,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=1.90"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 2,
      "approximate_length_mm": 10.08,
      "approximate_width_mm": 6.93,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=2.00"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 2.1,
      "approximate_length_mm": 10.24,
      "approximate_width_mm": 7.04,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=2.10"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 2.2,
      "approximate_length_mm": 10.4,
      "approximate_width_mm": 7.15,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=2.20"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 2.3,
      "approximate_length_mm": 10.56,
      "approximate_width_mm": 7.26,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=2.30"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 2.4,
      "approximate_length_mm": 10.71,
      "approximate_width_mm": 7.36,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=2.40"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 2.5,
      "approximate_length_mm": 10.86,
      "approximate_width_mm": 7.46,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=2.50"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 2.6,
      "approximate_length_mm": 11,
      "approximate_width_mm": 7.56,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=2.60"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 2.7,
      "approximate_length_mm": 11.14,
      "approximate_width_mm": 7.66,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=2.70"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 2.8,
      "approximate_length_mm": 11.28,
      "approximate_width_mm": 7.75,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=2.80"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 2.9,
      "approximate_length_mm": 11.41,
      "approximate_width_mm": 7.84,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=2.90"
    },
    {
      "shape_slug": "oval",
      "shape_label": "Oval",
      "carat_weight": 3,
      "approximate_length_mm": 11.54,
      "approximate_width_mm": 7.93,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=oval&carat=3.00"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 1,
      "approximate_length_mm": 7,
      "approximate_width_mm": 5,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=1.00"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 1.1,
      "approximate_length_mm": 7.23,
      "approximate_width_mm": 5.16,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=1.10"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 1.2,
      "approximate_length_mm": 7.44,
      "approximate_width_mm": 5.31,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=1.20"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 1.3,
      "approximate_length_mm": 7.64,
      "approximate_width_mm": 5.46,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=1.30"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 1.4,
      "approximate_length_mm": 7.83,
      "approximate_width_mm": 5.59,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=1.40"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 1.5,
      "approximate_length_mm": 8.01,
      "approximate_width_mm": 5.72,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=1.50"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 1.6,
      "approximate_length_mm": 8.19,
      "approximate_width_mm": 5.85,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=1.60"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 1.7,
      "approximate_length_mm": 8.35,
      "approximate_width_mm": 5.97,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=1.70"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 1.8,
      "approximate_length_mm": 8.52,
      "approximate_width_mm": 6.08,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=1.80"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 1.9,
      "approximate_length_mm": 8.67,
      "approximate_width_mm": 6.19,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=1.90"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 2,
      "approximate_length_mm": 8.82,
      "approximate_width_mm": 6.3,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=2.00"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 2.1,
      "approximate_length_mm": 8.96,
      "approximate_width_mm": 6.4,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=2.10"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 2.2,
      "approximate_length_mm": 9.1,
      "approximate_width_mm": 6.5,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=2.20"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 2.3,
      "approximate_length_mm": 9.24,
      "approximate_width_mm": 6.6,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=2.30"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 2.4,
      "approximate_length_mm": 9.37,
      "approximate_width_mm": 6.69,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=2.40"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 2.5,
      "approximate_length_mm": 9.5,
      "approximate_width_mm": 6.79,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=2.50"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 2.6,
      "approximate_length_mm": 9.63,
      "approximate_width_mm": 6.88,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=2.60"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 2.7,
      "approximate_length_mm": 9.75,
      "approximate_width_mm": 6.96,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=2.70"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 2.8,
      "approximate_length_mm": 9.87,
      "approximate_width_mm": 7.05,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=2.80"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 2.9,
      "approximate_length_mm": 9.98,
      "approximate_width_mm": 7.13,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=2.90"
    },
    {
      "shape_slug": "emerald",
      "shape_label": "Emerald",
      "carat_weight": 3,
      "approximate_length_mm": 10.1,
      "approximate_width_mm": 7.21,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=emerald&carat=3.00"
    },
    {
      "shape_slug": "dutch_marquise",
      "shape_label": "Dutch Marquise",
      "carat_weight": 1,
      "approximate_length_mm": 9.4,
      "approximate_width_mm": 5.1,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=dutch_marquise&carat=1.00"
    },
    {
      "shape_slug": "dutch_marquise",
      "shape_label": "Dutch Marquise",
      "carat_weight": 1.1,
      "approximate_length_mm": 9.7,
      "approximate_width_mm": 5.26,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=dutch_marquise&carat=1.10"
    },
    {
      "shape_slug": "dutch_marquise",
      "shape_label": "Dutch Marquise",
      "carat_weight": 1.2,
      "approximate_length_mm": 9.99,
      "approximate_width_mm": 5.42,
      "facet_url": "https://jacobiusmakes.github.io/facet-diamond-tool/?via=data&shape=dutch_marquise&carat=1.20"
    },
    {
      "shape_slug": "dutch_marquise",
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}