Other benchmarks include: the "Ideal Brilliant" (developed in 1929 by Johnson and Roesch), the "Parker Brilliant" (1951), and the "Eulitz Brilliant" (1968) The Ideal and Parker brilliants are disused because their proportions result in (by contemporary standards) an unacceptably low brilliance. The Eulitz cut is the only other mathematically derived benchmark; it is also historically the only benchmark to consider girdle thickness. A more modern benchmark is that set by Accredited Gem Appraisers (AGA). Although their standard generally makes a modern ideal cut it has been criticised for being overly strict. A summary of the different benchmarks is given below: