Found in Chapter 2-2 in a chest in the mines. It sells for ₦4,000.
Square (Topaz · Ruby · Sapphire · Emerald · Diamond)
Oval (Topaz · Ruby · Sapphire · Emerald · Diamond)
Brilliant (Topaz · Ruby · Sapphire · Emerald · Diamond)
Trilliant (Topaz · Ruby · Sapphire · Emerald · Diamond)
Marquise (Topaz · Ruby · Sapphire · Emerald · Diamond)