The Trifari brooch above is made of yellow glass. A princess cut is a square-cut stone. This fancy cut is relatively new and is also known as a Quadrillion or Squarillion cut. Pt. is an abbreviation for platinum . Diamonds have a hardness of 10, a specific gravity of 3.5, and a refractive index of 2.417 - 2.419.
Marcasite stones come from pyrite.
Red garnet is the birthstone for January. American Ruby, Arizona Ruby, Australian Ruby, Bohemian Ruby, California Ruby, Cape Ruby, Colorado Ruby, Elie Ruby, Montana Ruby, and Rocky Mountain Ruby. Search the Web with our sponsor, Overture. Without our visitors' support, Enchanted Learning would soon be off-line.