The best Jewel for NATURAL type is
NATURAL type matches opaque stones. Opaque stones are coral, turquoise, jade, onyx, etc. As its name suggests, NATURAL type matches the accessories made of natural materials like shell, tortoiseshell, wood, and leather etc. Regarding pearl, baroque pearl is the best for NATURAL type because they matches irregularly shaped items than Genuine pearl.
･Opaque stones (coral, turquoise, jade, onyx, etc)
･Natural materials (shell, tortoiseshell, wood, leather, etc)
･Precious stones (diamond, ruby, emerald, sapphire, etc)
･Semiprecious stones (garnet, amethyst, topaz, peridot etc)
･beads (opaque one is better)