Other Blog. Solitaire Solitaire is the ring with single diamond in the setting and represents symbol of “single love". It is popular for use in engagement. Ruby Ruby is the gemstone in the Corundum family with hardness inferior to diamond. It is popular for use in making jewelry with high commercial value. Black Diamond Black diamond is the diamond with more carbon content than diamond in other colors and maximum hardiness and used as diamond for general diamond cutting.
