What to know about Gemstone value
The value of gemstones depends on the 4c's and depends on how rare that gemstone is. Like anything else the supply and demand also has a big impact in the price, if there is alot of that one gemstone, logically the price will be lower.
If you dont know about the for 4c's please check my other guide.
Most Valuable? Meaning Most Expensive? Most Durable? Rarest?
Prices are calculated by the 4cs and by how rare they are. Prices are calculated per Carats.
We dont have the trading prices in hand because it changes as time goes one good website is gemval dot com.
You can get all the latest prices there.
Here is the list of the most common gemstones highest value first to least:
Tripple A grade Ceylon or Kanchanaburi Sapphire
Triple A grade Emerald/Ruby
Salt Water South Sea Pearls
Tsavorite (green ) Garnet & Spessartite (Orange) Garnet
Tourmaline - Indicolite, Watermelon and Rasberry
Other Beryl's (Aquamarine, Morganite, Goeshenite)
Zircon (especially blue, but red, white and golden as well)
Cultured Pearls - at least AA grade
Common Topaz - Sky blue, Swiss blue, etc...
Garnet (red - almandine, pyrope, etc...)
Quartz- Amethyst, Citrine, Rutillated, etc...
Cubic Zirconia and other man made stones.
There is no set formula for the pricing of precious gemstones bases on a value to carat-weight/size ratio, but as a rule of thumb, the larger a gemstone is, the rarer it is, causing an exponential increase in price, According to Tavernier's Law the calculation for determining the price of a gemstone is: Wt2 x C = Gemstone Price
Wt is carat weight of stone, C is the cost of one carat of same quality gemstone.
Of course this is not an absolute price solution, but is a good price indicator.
Here is the list of the rarest Gemstones highest value first to least:
Jadeite - 3 million USD per Carat
Red Diamonds - 2 million USD per Carat
Serendibite - 1.8 million USD per Carat
Blue Garnet - 1.5 million USD per Carat
Painite - 60 000 USD per Carat
Grandidierite - 50 000 USD per 0.5 Carat
Musgravite - 35 000 USD per Carat
Red Beryl Emrald - 10 000 USD per Carat
Black Opal - 2 355 USD per Carat
Jeremejevite - 2 000 USD per Carat
Prices also depends on how much the buyer want that gemstone and how much he is willing to spend for it.
I hope this guide helped you make your choice on what to buy, please check my other guides.
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Thank you :)