Rin
"It looks like pink zircon and blue sapphires. See how the stone refracts the light? Tourmaline, spinel, and sapphire aren't able to do that," Rin explained, "And the metal looks like platinum, which is sturdier than gold."
The shopkeeper, who's nose seemed like it was permanently in the air, strode over to them and opened the glass case. She said, "You have a good eye, young lady, you're absolutely right on all accounts."
Rin nudged Sakura and said, "Try it on, see if we need to get it sized."