"piedra preciosa" meaning in Spanish

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "osp",
        "3": "piedra preçiosa"
      },
      "expansion": "Old Spanish piedra preçiosa",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old Spanish piedra preçiosa.",
  "forms": [
    {
      "form": "piedras preciosas",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "piedra preciosa f (plural piedras preciosas)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "gemstone"
      ],
      "id": "en-piedra_preciosa-es-noun-QCXGEbE1",
      "links": [
        [
          "gemstone",
          "gemstone"
        ]
      ],
      "synonyms": [
        {
          "word": "gema"
        }
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "word": "piedra preciosa"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "osp",
        "3": "piedra preçiosa"
      },
      "expansion": "Old Spanish piedra preçiosa",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old Spanish piedra preçiosa.",
  "forms": [
    {
      "form": "piedras preciosas",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "piedra preciosa f (plural piedras preciosas)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 2 entries",
        "Pages with entries",
        "Spanish countable nouns",
        "Spanish entries with incorrect language header",
        "Spanish feminine nouns",
        "Spanish lemmas",
        "Spanish multiword terms",
        "Spanish nouns",
        "Spanish terms derived from Old Spanish",
        "Spanish terms inherited from Old Spanish"
      ],
      "glosses": [
        "gemstone"
      ],
      "links": [
        [
          "gemstone",
          "gemstone"
        ]
      ],
      "synonyms": [
        {
          "word": "gema"
        }
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "word": "piedra preciosa"
}