What comes after a diamond?
What comes after a diamond? The second hardest gemstone after a diamond is a corundum, which includes both sapphires and rubies. Corundum has a hardness of 9 on the Mohs scale of mineral hardness. The Mohs scale ranges from 1 to 10, with 10 being the hardest (diamond) and 1 being the softest.
Why is platinum so expensive?
HARDER, BETTER, RARER, STRONGER Whilst 1,500 tons of gold are mined annually, only 160 tons of platinum are extracted. Platinum is also denser than gold, thus heavier. Because precious metals are priced by weight, platinum has long been the high-cost option in the context of buying jewellery.