The Kyklopes;
"After ten years of fighting [the Gods against the Titanes] Ge prophesied a victory for Zeus if he were to secure the prisoners [the three Kyklopes] down in Tartaros as his allies ... [he did so and] the Kyklopes gave Zeus thunder, lightning, and a thunderbolt, as well as a helmet for Plouton [Haides] and a trident for Poseidon. Armed with these the three gods overpowered the Titanes, confined them in Tartaros." - Apollodorus, The Library 1.6-7
what was hades' throne made of
The Greeks didn't make Hades. Hades' parents the Titans Kronus and Rhea made Hades.
Persephone was kidnapped by hades and was made his wife.
The cyclops had made it for Hades.
The Cyclopes forged Hades' helmet
Greek myth does not say what the palace of Hades is made of.
The cyclopes made hades his helm of darkness.
The Cyclopes made Hades his Black Crown Of Invisibility
He made Hades a helmet that could make him invisible.
Hades had a "cap of invisibility." The Helm of Hades made the wearer invisible to both gods and mortals.
in the golden age
Hades is often referred to as Hell by modern mistake.