After buying clothes, Sirius took Harley and Hermione on a proper tour of Diagon Alley. Then he led them down a little street that no one usually showed them and into a jewelry shop.
Needless to say, the loaded Sirius promptly ordered a huge quantity of precious jewelry, determined to keep living the life of a rich spendthrift.
After they returned to Number 12 Grimmauld Place, Sirius reminded them, "You won't need those dress robes and custom-made jewelry for a while, so I'll send them to you by owl when the time comes."
"I have to visit the vault at Gringotts. If I remember correctly, there are still some precious gems in those piles of jewels in the Black family vault."
"If we have them cut into diamond rings and enchant them, they'll look absolutely beautiful."
"If I can't find any good magical accessories, I'll go buy some from the goblins!"
"No need, Sirius," Harley said, trying to dissuade him. "For my birthday last month, Nicolas told me I could provide him with jewelry, and he'd personally enchant it and use alchemy on it."
"His skills aren't much worse than those of an ordinary goblin."
"Hmm? All right, then." Sirius was taken aback for a moment, then nodded. "That'll work too. As long as there's enough time."
Then Sirius fell silent and deliberately started reading the newspaper off to the side.
Clearly, he was waiting for Harley and Hermione's curiosity to get the better of them. He expected them to ask why Hogwarts wanted them to order robes and what they needed the jewelry for.
But Harley and Hermione didn't ask him anything.
Fleur had already told them about the Triwizard Tournament. It wasn't hard to guess that the custom clothes and jewelry were for some sort of ball during