My son is crazy about gems, and this collection made an excellent gift.  There were about 8 different types of stones in the collection we received, mostly small amethysts and a dark red stone (garnet?).  But there were some yellows and beautiful light blues and a few greens and whites.  He also has the Smithsonian Handbook Gemstones.  Now he is asking for a microscope to study the stones.  I am pleased!