(MOP0007) Mother of Pearl, triangular shape.
 
  
     
      | 
         MOP0001 | 
         MOP0002 | 
         MOP0003 | 
     
      | 
         MOP0004 | 
         MOP0005 | 
         MOP0006 | 
     
      | 
         MOP0007 | 
         MOP0008 | 
         MOP0009 | 
	
	     
      | 
         MOP0010 | 
         MOP0011 | 
         MOP0012 | 
	
  
 
  Concretion formed by a mollusk consisting of the same material (called nacre, 
  or mother-of-pearl) as the mollusk's 
  shell. It is a highly valued gemstone. Pearls are characterized by their 
  translucence and lustre and by a delicate play of surface colour called 
  orient. The more perfect its shape (spherical or droplike) and the deeper its 
  lustre, the greater its value. Only those pearls produced by mollusks whose 
  shells are lined with mother-of-pearl (e.g., certain species of both saltwater 
  oysters and freshwater clams) are really fine pearls; pearls from other 
  mollusks are reddish or whitish, porcellaneous, or lacking in pearly lustre. 
  Jewelers commonly refer to saltwater pearls as Oriental pearls and to those 
  produced by freshwater mollusks as freshwater pearls.