R1 opal

R2

a. amonite

b. amonite

R3

a. amethyst

b. tourmaline

c. aquamarine

d. tanzanite

e. 03ct diamond

R4

a. aquamarine

b. tanzanite

c. blue zircon

R5

a. tanzanite, blue
zircon

b. spessertite,
rhodalite, amethyst

c. tourmaline,
tanzanite, diamond

d. citrine,
tanzanite, diamond

R6

a. tourmaline

b. tourmaline,
tanzanite, diamond

c. opal, tanzanite

d. peridot, tanzanite

R7

a. tourmaline, garnet

b. tourmaline sapphire

c. peridot, tanzanite

R8 diamond