Unlike most gemstones that have a variety of locales, this relatively new stone has only been found in Northern Tanzania. The first gemstone was discovered by Masai tribesman Ali Juuyawatu in 1967.
Tanzania stone is a blue gem quality zoisite, is one of the official birthstone of December. Experts predict that Tanzania stone supply could run out in the next 20 to 30 years, make the stone more rare than diamonds significantly.
Tip: Tanzanite ranks 6-7 on the Mohs Scale of Hardness so it is durable enough for everyday wear. The most prized color is a pure blue that is almost indistinguishable from blue sapphire. Most tanzanite owes its color intensity to heat treatment. In order to maximize color potential, seek stones 5 carats of greater.
Demantoid is a compelling green varieties edradto garnet, found in the middle of the 18th century in Russia. Although other types of warm color garnet is considered to be normal and cheap, but Diane garnet garnet is the jewel in the family is the most rare and valuable.
Tip: Demantoid garnet is between 6.5-7.5 on the Mohs Scale of Hardness so the stone is durable for everyday wear with the proper care. Since this variety of garnet is rarely found in large sizes, your best bet is to seek a stone between .5 – .75 carats. Be sure it is cut well to show off the stone’s natural brilliance.
Black opal is generally the most rare and the most popular type of opal, is also considered the rarest of all gems. Nearly all of the world’s black opal supply lightning ridge mining in new south wales, Australia.
Tip: The main characteristic that will differentiate black opal from common opal is its body tone. Though black opals can come in many colors, their overall composition is on the darker end of the spectrum.
However, there are synthetic black opals and treatments on the market that are difficult to identify without the help of a lab. Be sure to buy black opal from a reputable dealer.
Padparadscaha (pronounced pad-pah-raj-ah) sapphires are extremely rare and found mostly in Sri Lanka as well as parts of Madagascar and Tanzania. Pink and orange tonal unique combination of this stone is one of the most sought-after collector. Gems have all sorts of color, but the medium tone seems to be the most beneficial and attractive.
Tip: This may mean opting for a stone with less clarity and a duller color or choosing a stone that is smaller in size. Shapes can often be unusual and varied because gem cutters try their best to maximize carat weight. This is due in large part to the rarity and demand factor for this stone. Don’t expect to find these sapphires over 2 carats without paying a premium.
The stone was discovered in 1830 in the Ural mountains of Russia, which is also home to other unusual minerals. The stone was subsequently named after Czar Alexander II.
Tip: Smaller varieties of alexandrite have been mined in Sri Lanka, Brazil, and Asia, but fine alexandrite specimens are still very rare and costly.
If you found a legendary gem, Alexander size, and has excellent clarity, can you handle a synthesis. These stones are usually blue and purple and green and red, is actually a synthetic corundum.