G.B. Diamond Builders is a fictional business featured in the Demonic Toys film series. It appeared in a flashback in a scene in the original 1992 horror film, Demonic Toys.
G.B. Diamond Builders was a construction firm that existed in the 1920s. In 1925 it began construction on a site that would later be occupied by the Arcadia Toys warehouse facility. On Halloween night of that year, a couple named Doctor Michaels and Mrs. Michaels attempted to midwife a demon baby, but the monstrous infant was stillborn. They placed the body into a black sack and gave it to three trick-or-treaters, with instructions to "plant" it like a seed to see what crop would ultimately spring forth. The children agreed and ran off before realizing what they were carrying. When they opened the bag, they found the demon baby corpse and discarded it. The body landed in the foundation of a site being developed by G.B. Diamond Builders.
It remained buried, housing the spirit of a powerful demon for sixty-six years until finally awakened by the blood of an injured man, which had seeped through the cracks in the floor onto the spot where the demon vessel laid.