Luminous Stone

are recurring NaN Items in.

Luminous Stones can be found by breaking Luminous Stone Deposits, which can be identified by their glow during the night. They are also dropped by NaN Stone Talus (Luminous)s upon their defeat. The Kochi Dye Shop can use Luminous Stones to make Navy Dye. Three of them are also required to buy one piece of the Radiant Set at the Gerudo Secret Club.

If BotW: speaks to Ledo at BotW:, he will explain that he needs more Luminous Stones in order to continue his repairs. He will ask Link to gather ten Luminous Stones for him, which will initiate the "Luminous Stone Gathering" Side Quest. Upon delivery, Ledo will reward Link with two NaN Diamonds. Afterwards, Link can bring him ten Luminous Stones at any time in exchange for one Diamond.

The Radiant Set requires Luminous Stones the be upgraded to its first, second, third, and fourth tier at a BotW:.

Trivia

 * Luminous Stone is very similar to an item from the game Terraria, which goes by the name Luminite. Given the fact that Luminite was created 2 years before Breath of the Wild's release and a developer quote stating that they had taken direct inspiration from Terraria, It's relatively safe to assume Luminous Stone is based off of Luminite. However, this has not yet been confirmed and is entirely speculation.