50 usd per kg
raw black tourmaline is worth about 50 usd per kg
Tourmaline is commonly black but is sometimes rose, blue, pink and most rare green. Green tourmaline is worth about £70 per gramm if it is of a moderate quality.
Blue Tourmaline is extremely rare. Very few suppliers have a Kg in stock. What is available once in a Blue Moon is in the range of a hundred carats depending on the auction the price range 1 to 3 bucks per carat. That's $3 x 5 x 1000 = $15,000 estimated for Blue Tourmaline rough.
Black Opals are rare. Depending on the size, oval shape, etc. the value of a black opal can be listed at approximately USD $1000 per carat.
Black opal can be very expensive, only low grade black opal is sold by kilo weight. This low grade is called potch and colour which means that maybe bit of colour might be in this rough black opal I have seen parcels sold for $200 per kilo but it has no colour. Good kilo bucket of rough black opal would cost around $5,000 .00 Black opal is rated by body tone N1 for deep black colour, and N4 for light black colour. So for $5000 per kilo, dont expect N1 body tone. Black opal is sold by carat, and rare patterns are worth $5,000 to $20,000 per carat; especially red fire harlequin pattern n1 body tone, and over brighness rating of 4.
raw black tourmaline is worth about 50 usd per kg
Tourmaline is commonly black but is sometimes rose, blue, pink and most rare green. Green tourmaline is worth about £70 per gramm if it is of a moderate quality.
Black diamonds can be estimated approx. $10,000 per carat.
It depends on whether it is treated or natural. The cost of a treated black diamond ranges from as low as $100 to $200 per carat whereas a natural diamond, which is GIA certified the cost per carat ranges from $2500 to $3000, depending on the quality.
Blue Tourmaline is extremely rare. Very few suppliers have a Kg in stock. What is available once in a Blue Moon is in the range of a hundred carats depending on the auction the price range 1 to 3 bucks per carat. That's $3 x 5 x 1000 = $15,000 estimated for Blue Tourmaline rough.
It depends on the seller and quality but on average it is worth about $196 per caratAnother AnswerAccording to the link, below, the average purchase price is slightly higher for one carat of black diamond: US$1,015 to US$1,450.
What is a 22 carat gold coin wei of 39 grams worth
12k gold would be worth about $487.50 per ounce.
do the math
Every diamond is valued by its carat weight, its colour, its cut and its clarity. There is no standard. Without endorsement, you can price black diamonds, below.
A diamond is valued by its cut, clarity, carat weight and colour. A local jeweler can show you a stone and give you a precise answer.
23CARAT is 36 U.S $ per gram approx