Home » Learning Center » List of Gemstones by Name » Demantoid Garnet Value, Price, and Jewelry Information Demantoid Garnet Value, Price, and Jewelry Information “Demantoid Garnet,” modified square/cushion cut, 6.0 x 6.0 x 5.0 mm, 1.88 cts, Antetezambato, Ambanja District, Antsiranana Province, Madagascar. © Rob Lavinsky, www.iRocks.com.
8. Black Opal – $3,500 per carat. Opal gemstones have a different evaluation process than other gemstones with each one of them having their own distinct individuality. Compared to other opals, black (with body tones from N1 to N4) are considered rarest and most popular.
Benitoite – $3,800 per carat Considered as one of the most beautiful gems, Benitoite has a striking blue body color that has a dispersion higher than a diamond. As its name, it was discovered by the headwaters in San Benito River in San Benito County, California where it’s now declared as its state gem.
NOTE: all prices are per carat, so you need to multiply the price per carat to the carat weight of the gem (ie: a Padparadscha Sapphire that is 1.50 carats, "O" hue, "Exceptional" tone and saturation, and "VVS" clarity, is priced at $6,000 to $12,500 per carat, so the total Retail price would be 1.5 x $6,000 = $9,000 on the low side, and 1.5 x $12,500 = $18,750 on the high side of the Retail price).
Benitoite is a rare gemstone, and for all practical purposes only comes from a single limited deposit in California. It is a relatively new gemstone, and was first discovered in 1907. Benitoite gemstones have a sapphire-blue color, and can have very good transparency and luster.
Red beryl is an extremely rare variety of beryl that receives its red color from trace amounts of manganese. In the entire world, crystals suitable for cutting gems have been found in only one location, the Ruby-Violet claims in the Wah Wah Mountains of Beaver County, Utah.
Alexandrite is a stone that is associated with discipline and self-control. Many believe that alexandrite and chrysoberyl stones can promote concentration and strengthen the ability to learn. It also helps in evoking the wearer of the stone to strive for excellence.