"American diamond" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "American",
        "3": "diamond"
      },
      "expansion": "American + diamond",
      "name": "compound"
    }
  ],
  "etymology_text": "From American + diamond. From the prevalence of substituting synthetic cubic zirconia for diamond in jewelry of the United States of America.",
  "forms": [
    {
      "form": "American diamonds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "American diamond (plural American diamonds)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "english": "another common American substitute for diamond",
          "word": "moissanite"
        },
        {
          "word": "poor man's diamond"
        }
      ],
      "glosses": [
        "synthetic cubic zirconia"
      ],
      "id": "en-American_diamond-en-noun-va5CYAs8",
      "links": [
        [
          "synthetic",
          "synthetic#English"
        ],
        [
          "cubic zirconia",
          "cubic zirconia#English"
        ]
      ]
    }
  ],
  "word": "American diamond"
}

{
  "coordinate_terms": [
    {
      "english": "another common American substitute for diamond",
      "word": "moissanite"
    },
    {
      "word": "poor man's diamond"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "American",
        "3": "diamond"
      },
      "expansion": "American + diamond",
      "name": "compound"
    }
  ],
  "etymology_text": "From American + diamond. From the prevalence of substituting synthetic cubic zirconia for diamond in jewelry of the United States of America.",
  "forms": [
    {
      "form": "American diamonds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "American diamond (plural American diamonds)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "synthetic cubic zirconia"
      ],
      "links": [
        [
          "synthetic",
          "synthetic#English"
        ],
        [
          "cubic zirconia",
          "cubic zirconia#English"
        ]
      ]
    }
  ],
  "word": "American diamond"
}