1) алмаз
2) ромб || ромбовидный
3) сердечник ( крестовины стрелочного перевода )
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- artificial diamond
- carbonado diamond
- chemically polished diamond
- commercial Bort diamond
- commercial carbonate diamond
- cubic diamond
- cutting diamond
- dressing diamond
- drilling diamond
- gem diamond
- glass diamond
- mechanically rounded diamond
- metal-bonded diamond
- movable diamond
- natural diamond
- pencil diamond
- plane-faced diamond
- plane-face diamond
- polished diamond
- recovered diamond
- rigid diamond
- round diamond
- single-point diamond
- synthetic diamond