Diamond Records was a Russian pirate label \ company. Probably belonged to one 'family' with Generation X Records and Hyper Records (3). Mostly active in late 1990s, early 2000s.
CDs released by this label usually contain the following texts on the back cover:
(P) & (C) 2000 Diamond Records
Exclusive limited edition
Made in Germany by Diamond Records
Barcodes '4 009880 588925' (4009880588925) and '7 31453 33552 3' (731453335523) appear on many different releases of this company.
Releases usually contain DR- in matrix numbers.