Grammar Note
该形容词通常仅作定语（如 a diamond ring），不作表语；不说 *The ring is diamond*，而说 The ring is made of diamond。也不用于比较级。
钻石制的；含钻石的
先理解核心含义，再看它在真实句子里的用法。
钻石制的；含钻石的
made of or containing diamond
She wore a diamond necklace to the evening party.
她戴着一条钻石项链去参加晚会。
由钻石制成或含有钻石
Made of, or containing diamond, a diamond or diamonds.
与六十周年纪念相关的
Of, relating to, or being a sixtieth anniversary.
与七十五周年纪念相关的
Of, relating to, or being a seventy-fifth anniversary.
The store window displayed a diamond bracelet under the light.
商店橱窗在灯光下展示了一条钻石手链。
He bought her a diamond brooch for her birthday.
他为她的生日买了一枚钻石胸针。
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该形容词通常仅作定语（如 a diamond ring），不作表语；不说 *The ring is diamond*，而说 The ring is made of diamond。也不用于比较级。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from ECDICT, WIKTIONARY.