FIELD: production of jewelry articles. SUBSTANCE: preliminary polished samples are placed in 5-35% alkali solution (LiOH, NaOH, KOH) followed by their treatment under hydrothermal conditions at T = 50-300 C and P = 50-500 atm for 5-25 h. The obtained jewels of chalcedony group exhibit the improved decorative property due to the enhanced jewel brightness and picture degree of contrast. EFFECT: improved artistic-decorative properties of jewels.
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| PROCESS OF WORKING DECORATIVE STONES OF THECHALCEDONY GROUP AND ARTICLES MADE THEREFROM | 0 |
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