1. colour The colorless crystal is clean and translucent as the standard. Rangli kristallning rangi bir xil bo'lishi kerak, toza va ajoyib. Ametist va topaz kristallarning eng qimmatli navlari hisoblanadi. Ikkalasining keyingi tasnifi quyuqroq rangdir (lekin standart kabi qorong'i emas) yaxshiroq. Ichida [...]
