{
 "dataset": "GDCS Lab-Grown Diamond Benchmark Price List",
 "issue": "2026-10-02",
 "publisher": "Association for Intelligent Diamond International",
 "page": "https://gdcs.ai/prices/2026-10-02/",
 "licence": "https://creativecommons.org/licenses/by/4.0/",
 "citation": "GDCS, Association for Intelligent Diamond International. (2026). GDCS Lab-Grown Diamond Benchmark Price List, issue 2026-10-02 [Data set]. https://gdcs.ai/prices/2026-10-02/",
 "fields": [
  {
   "name": "issue",
   "description": "Issue date of the price list."
  },
  {
   "name": "rules",
   "description": "Version of the GDCS rules that produced it; the rules file is at /rules/<version>.json."
  },
  {
   "name": "band_from_ct",
   "description": "Lower edge of the carat band."
  },
  {
   "name": "band_to_ct",
   "description": "Upper edge of the carat band."
  },
  {
   "name": "carat_used",
   "description": "The carat weight inside the band at which the figure is computed."
  },
  {
   "name": "colour",
   "description": "Colour grade, GDCS/T—2027."
  },
  {
   "name": "clarity",
   "description": "Clarity grade, GDCS/T—2027."
  },
  {
   "name": "usd_per_ct",
   "description": "Benchmark price in US$ per carat for a loose round stone at the base cut, before any brand premium."
  }
 ],
 "basis": "Loose stone, round, base cut, before any brand premium. US$ per carat.",
 "rules_file": "https://gdcs.ai/rules/v8.json",
 "price_level": {
  "dataset": "Diamond Price Index",
  "publisher": "The Diamond Price",
  "url": "https://thediamondprice.com/data/diamond-price-index/",
  "licence": "https://creativecommons.org/licenses/by/4.0/",
  "citation": "The Diamond Price. (2026). Diamond Price Index [Data set]. Retrieved from https://thediamondprice.com/data/diamond-price-index/",
  "read_on": "2026-10-02",
  "file_sha256": "1fa489ecfa121b1e839cca807bf1e9cf2b5a22da525d43d5d14dbedefa79aaac",
  "rows_used": 14,
  "A": 714.52,
  "k": 0.1583,
  "changes": "Adapted: the data set's lab-grown rows are fitted to the GDCS formula; none of its own figures is reprinted."
 },
 "tier_premium_pct": {
  "Diamond": 9.7,
  "Gold": 7.3,
  "Silver": 4.9,
  "Bronze": 2.4,
  "Under Review": 0.0
 },
 "adjustments": {
  "cut": {
   "Excellent": 1.0,
   "Very Good": 0.9,
   "Good": 0.8,
   "Fair": 0.7,
   "Poor": 0.6
  },
  "method": {
   "HPHT": 1.05,
   "CVD": 0.95
  },
  "shape": {
   "round": 1.0,
   "oval": 0.95,
   "pear": 0.95,
   "cushion": 0.9,
   "square": 0.9,
   "emerald": 0.92,
   "radiant": 0.93,
   "marquise": 0.92,
   "heart": 0.92
  }
 },
 "fancy_colour": {
  "carat": [
   0.3,
   5.0
  ],
  "basis_colour": "F",
  "hue": {
   "yellow": 1.0,
   "pink": 1.0,
   "blue": 1.0,
   "red": 1.0,
   "green": 1.0,
   "brown": 0.7
  },
  "intensity": {
   "FL": 0.85,
   "F": 0.9,
   "FI": 1.0,
   "FD": 1.0,
   "FV": 1.1
  }
 },
 "rows": [
  {
   "issue": "2026-10-02",
   "rules": "v8",
   "band_from_ct": 0.3,
   "band_to_ct": 0.39,
   "carat_used": 0.342,
   "colour": "D",
   "clarity": "LC",
   "usd_per_ct": 740
  },
  {
   "issue": "2026-10-02",
   "rules": "v8",
   "band_from_ct": 0.3,
   "band_to_ct": 0.39,
   "carat_used": 0.342,
   "colour": "D",
   "clarity": "VVS1",
   "usd_per_ct": 720
  },
  {
   "issue": "2026-10-02",
   "rules": "v8",
   "band_from_ct": 0.3,
   "band_to_ct": 0.39,
   "carat_used": 0.342,
   "colour": "D",
   "clarity": "VVS2",
   "usd_per_ct": 690
  },
  {
   "issue": "2026-10-02",
   "rules": "v8",
   "band_from_ct": 0.3,
   "band_to_ct": 0.39,
   "carat_used": 0.342,
   "colour": "D",
   "clarity": "VS1",
   "usd_per_ct": 660
  },
  {
   "issue": "2026-10-02",
   "rules": "v8",
   "band_from_ct": 0.3,
   "band_to_ct": 0.39,
   "carat_used": 0.342,
   "colour": "D",
   "clarity": "VS2",
   "usd_per_ct": 640
  },
  {
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   "band_to_ct": 0.39,
   "carat_used": 0.342,
   "colour": "D",
   "clarity": "SI1",
   "usd_per_ct": 600
  },
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   "band_to_ct": 0.39,
   "carat_used": 0.342,
   "colour": "D",
   "clarity": "SI2",
   "usd_per_ct": 560
  },
  {
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   "rules": "v8",
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   "band_to_ct": 0.39,
   "carat_used": 0.342,
   "colour": "D",
   "clarity": "P",
   "usd_per_ct": 460
  },
  {
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   "band_from_ct": 0.3,
   "band_to_ct": 0.39,
   "carat_used": 0.342,
   "colour": "E",
   "clarity": "LC",
   "usd_per_ct": 710
  },
  {
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   "colour": "E",
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