2. A clear, hard variety of corundum used as a gemstone that is usually blue but may be any color except red. һ�����ļ�Ӳ����������ʯ��ͨ��Ϊ��ɫ����Ҳ�����dz���ɫ���������κ���ɫ��
3. Luminiferous gem is the man made modern night shining jewel developed with modern technology by research workers and caused strong echo in gemstone circle. ���ⱦʯ�ǽ������ҹ��Ŀ�ѧ�����������ִ���ѧ�������Ƴ��ġ��ִ�ҹ���顱���ڱ�ʯ������ǿ�ҷ��졣
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n.
1. a crystalline rock that can be cut and polished for jewelry