You'll typically notice less color while looking at the stone from the top down anyway (appraisers grade by looking at the side), and the metal of the setting further masks the tones.

通常情况下你从戒指上方看钻石时很少会注意到颜色(评估钻石的颜色级别是要看侧面的)，而底座的颜色则进一步掩盖了钻石的本色。

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The paper reviewed the mechanism, classification, corrosion prevention grade of metal pipelines as well as the corrosion features of the sea water pipeline.

本文阐述了金属材料腐蚀的机理、分类、耐腐蚀等级，以及海水管系腐蚀特点。

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The technical key to the dynamic optimization study of the rational mill feed grade of metal mines is the establishment of various mathematical models.

金属矿山合理入选品位动态优化研究的技术关键是建立各种数学模型。

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The materials then goes through a multi-tiered supply chain where they are sold and possibly resold several times before reaching facilities that specialize in either cutting and polishing gemstones and diamonds, or turning raw precious metal into jewelry-grade material.

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To wit, the engineers opted for 4130 chrome alloy steel, an aircraft-grade metal.

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