Hasenfeld-Stein Receives FireMark Princess Cut Patent

DTC Sightholder Hasenfeld-Stein has received a U.S. patent for its FireMark Princess Cut Diamond. U.S. Patent No. 8,181,482 protects FireMark’s characteristics, which result in its brilliance and light return of 98 percent.

According to the company, FireMark is the first princess diamond to rival an Ideal Round in brilliance and light return.
 
“We’ve always said there is no other princess diamond in the world like FireMark, and now, with the newly issued patent, it’s somewhat humbling to think there won’t be another like it for a very long time to come,” said vice president Hertz Hasenfeld.
 
“After years of trial and error, we determined that the combination of a higher crown, smaller table and shallower depth dramatically impacts the diamond’s light performance,” said Hasenfeld. A FireMark’s crown averages between 9.5 and 13.5 percent; the table is a maximum 68 percent (averaging 65 percent), and the depth is a maximum 70.9 percent (averaging 68 percent).
 
Other characteristics that distinguish a FireMark are: GIA “Excellent” in both polish and symmetry; GCAL “Excellent” in light performance; minimum 95 percent light return (average 98 percent); maximum length and width ratio of 1.025 and chamfered corners that are invisible to the naked eye
 
Hasenfeld also stressed the importance of the patent for the growing number of FireMark retail jewelers. “It protects our exclusive retailers against competitors making false claims, and it makes a strong statement that FireMark retailers are selling real value.”

FireMark Princess Cut Diamonds are available to independent retailers only.