Usually the dirt and grease that accumulated under the diamond causing it to refract less of the light through it and hence it appears darker than what it looked originally like . Another reason is the metal underneath the diamond loses the rhodium polish . The darker metal causes the diamond to appear dark .

The guests may choose to purchase the diamonds themselves or to sell them to smaller traders. Then the smaller traders cut the rough diamonds and sell the polished gems either to jewellery creators or to diamond wholesalers. The jewellery creators then put them into finished jewellery to sell them to jewellers.

Diamond mining is generally less harmful to the environment than other types of mining, such as gold mining, because it does not make use of toxic chemicals. In addition, landscapes altered by diamond mining can be rehabilitated.

Black diamonds are usually cheaper than white ones. This is partly because many of the black diamonds on the market are actually created in a lab. Natural black diamonds are relatively rare.

Generally speaking, there are three locations where most natural black diamonds are found: Brazil, the Central African Republic, and Kamchatka, Russia. While there are many diamonds mined in big pits, most black diamonds are actually found in riverbeds and other alluvial deposits.

Carbonado, commonly known as black diamond, is one of the toughest forms of natural diamond….

Dhanbad

India imports Anthracite coal from other countries. Coal is as valuable as diamond for the power Industries so it is commonly known as the Black Diamond.

Uses

SYDNEY: The world’s largest pink diamond mine has shut its doors after exhausting its reserves of the expensive gems, global mining giant Rio Tinto said Tuesday. It has since produced more than 865 million carats of rough diamonds, including a small but steady stream of prized pink stones, according to Rio Tinto.

90 to 95%

Reason for the closure Despite this, the increasing operation cost and a stagnant diamond market, are forcing Argyle mines to close by 2020. Another reason for the closure is that the mines are so deep now that further excavation is unviable.

To group the colors based on prices the relatively affordable colored diamonds are grey, brown and fancy yellow. Going to mid ranging prices it can be an intense and vivid yellow diamonds and orange diamonds. A group higher in prices are pink, purple, violet, green and blue diamonds.

colorless

Given their rarity, red diamonds are among the most expensive gemstones on average. Red diamonds can cost at least US$1 million per carat, and most of the known specimens are less than half a carat.

Red diamonds

A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). Other varieties of gem-quality corundum are called sapphires. Ruby is one of the traditional cardinal gems, together with amethyst, sapphire, emerald, and diamond. The word ruby comes from ruber, Latin for red.

To tell if your diamond is real, place the stone in front of your mouth and, like a mirror, fog it up with your breath. If the stone stays fogged for a few seconds, then it’s probably a fake. A real diamond won’t fog up easily since the condensation doesn’t stick to the surface.

The weight of a diamond has a huge impact on its value. Melee diamonds are small—between 0.001 and 0.2 carats—so they are not very valuable. The average price of a 0.50 carat diamond is $1,500, and the largest melee diamonds are less than half of this weight.