英文關鍵字
adamant
artificial
capsule
carbon
carbuncle
chemical
chemistry
color
contemporary
crystallized
cultivated
cultured
cvd
day
deep
diamond
earth
factory
form
formation
gem
gems
gemstone
geological
graphite
grown
high
hpht
inside
jewel
jeweler
jewelry
lab
laboratory
made
man
manufactury
mined
minerals
natural
people
physical
press
presser
pressure
process
properties
real
stone
synthetic
technology
temperature
time
women