FireMark® diamonds are, by far, some of the most brilliant diamonds in the world, and created by one of the leading Diamontaires in the jewelry industry– Hasenfeld-Stein. In business for over 70 years, Hasenfeld-Stein has the distinct reputation of producing the most extraordinary diamonds. Every FireMark® diamond is cut for perfection and for extreme scintillation. What separates a FireMark® diamond from all others, is not only the quality of each Princess or Cushion cut diamond, but the relentless pursuit of such perfection.