Book  (Apr 1993)  Page(s) 131.  
 
Diadem Hybrid Tea, orange-crimson suffused salmon and yellow, 1922, McGredy. Description.

Website/Catalog  (1936)  Page(s) 6.  
 
Diadem Hybrid Tea (S. McGredy & Son 1922) Description.

Book  (1936)  Page(s) 208.  
 
Diadem (HT) McGredy 1922; orange-crimson, shaded deep salmon-pink, coppery yellow, medium size, double, fine form, lasting, solitary, fragrance 3/10, floriferous, continuous bloom, growth 6/10, upright, 40 cm. Sangerhausen

Website/Catalog  (1929)  Page(s) 15.  
 
Everblooming Roses
The so-called Everblooming Roses include the Hybrid Tea and Pernetiana groups. They do not bloom all the time, but if kept healthy and growing steadily, one crop of flowers succeeds another at brief intervals.
Diadem. Hybrid Tea. (S. McGredy & Son, 1922.) A large, fragrant, double flower of copper-orange, with salmon and flame tints. Growth is fair, but none too liberal in bloom. Foliage is very good and quite hardy.
Splendid for cutting if taken in bud, although color is better outdoors. $1.50 each.

Website/Catalog  (1928)  Page(s) 12.  
 
Diadem HT. Color deep crimson, heavily overlaid orange crimson, diffused deep salmon and copper yellow; large, full, perfectly formed flowers; a good garden variety.. G. E. Vig. 

Website/Catalog  (1928)  Page(s) 9.  
 
Hybrid Teas, Teas  and Pernetiana.
Diadem. Hybrid Tea. (S. McGredy & Son, 1922.) Flower deep crimson, heavily overlaid orange crimson, suffused deep salmon and coppery yellow, perfect in shape and form; sweetly scented.

Website/Catalog  (1927)  Page(s) 85.  
 
Diadem (1922), cioppery, reminds of Herriot in colouring, but much more lasting and vigorous in habit and bloom. Excellent garden and cutting rose (Pernet). 1 piece M 1.-, 10 pieces M 9.-, 100 pieces M 80.-

Magazine  (Jun 1925)  Page(s) 203.  
 
Diadem (S. M'Gredy & Son). Rouge cramoisi foncé, fortement retouché de cramoisi orange, soufflé de saumon foncé et de jaune cuivré ; grande, pleine, très odorante.

Website/Catalog  (1924)  Page(s) 20.  
 
Rosiers Nouveaux de 1922. Rosiers Hybrides de Thé...
DIADEM (S. M.’Gredy & Son, 1922). Rouge cramoisi foncé, fortement retouché de cramoisi orange, soufflé de saumon foncé et de jaune cuivré ; gr., pl., tr. odor.

Website/Catalog  (1924)  Page(s) 47.  
 
Rosiers nouveaux 1922...Hybrides de Thé...
Diadem (Mc Gredy). — Fleur d’un coloris superbe, cramoisi foncé, fortement retouché de cramoisi orange recouvert de saumon foncé et de jaune cuivré. Grande, pleine, parfumée ; arbuste vigoureux.