Available in a variety of designs and shapes it connects the wearer to spiritual guidance and improves the communication skills. Smoky quartz is also present in the blue rock which is found in nambia africa. Spinel this is a translucent medium violet blue stone sodalite this is a very dark blue purple and gray stone star sapphire this is a stone that has a naturally formed blue star on top tanzanite this is a dark translucent violet blue color topaz a translucent stone from very light blue to medium blue.