how is it used politically?
UNANSWERABLE
we know that diamonds did not form from coal because UNANSWERABLE can you state any of its properties? Yes -  It is the hardest and least compressible. It has the highest thermal conductivity and the highest sound velocity. It has low adhesion and friction, and its coefficient of thermal expansion is extremely low. Its optical transparency extends from the far infrared to the deep ultraviolet and it has high optical dispersion. It also has high electrical resistance. It is chemically inert, not reacting with most corrosive substances, and has excellent biological compatibility. when was it discovered? Diamonds are thought to have been first recognized many centuries ago 3,000years but most likely 6,000years
wiki:1568267
Diamond [SEP] Etymology, earliest use and composition discovery
The name "diamond" is derived from the ancient Greek "ἀδάμας" "(adámas"), "proper", "unalterable", "unbreakable", "untamed", from ἀ- (a-), "un-" + "δαμάω" ("damáō"), "I overpower", "I tame". Diamonds are thought to have been first recognized and mined in India, where significant alluvial deposits of the stone could be found many centuries ago along the rivers Penner, Krishna and Godavari. Diamonds have been known in India for at least 3,000years but most likely 6,000years. Diamonds have been treasured as gemstones since their use as religious icons in ancient India. Their usage in engraving tools also dates to early human history. The popularity of diamonds has risen since the 19th century because of increased supply, improved cutting and polishing techniques, growth in the world economy, and innovative and successful advertising campaigns.