Ruby: Untreated natural rubies are extremely rare. They are actually significantly rarer than sapphires, which is why they are even more expensive. Emerald: Like sapphires and rubies, emeralds are among the rarest of all gemstones. They are rarer than sapphires but not quite as rare as rubies.
So back to the main question, is sapphire a rare gem? The answer is – yes! Sapphires are rarer than diamonds, but not so much in comparison to fine-quality emeralds or rubies. However, it's important to note that some types of sapphire are extremely rare.
The brilliance, durability and timelessness of diamonds keeps them as the more expensive of these two gems. A diamond of similar carat, cut and quality will cost more than a comparable sapphire.
Painite : Not just the rarest gemstone, but also the rarest mineral on earth, Painite holds the Guinness World Record for it. After its discovery in the year 1951, there existed only 2 specimens of Painite for the next many decades. By the year 2004, there were less than 2 dozens known gemstones.
Rarer than sapphire, emerald is valued for its rich color and symbolism.
diamond, a mineral composed of pure carbon. It is the hardest naturally occurring substance known; it is also the most popular gemstone. Because of their extreme hardness, diamonds have a number of important industrial applications.
Blue Diamond – $3.93 million per carat
The most expensive and rarest gemstone in the world is a natural blue diamond. That explains the price of $3.93 million per carat. Blue diamonds were discovered in India and later displayed in a London collection in 1839. Traces of boron give blue diamonds their distinctive hue.
Rough moldavites up to 235 g in weight (about 1,1175 cts) exist, but pieces that large are very rare.
How Rare is Amethyst? Not very rare, it is plentiful, but with all gemstones, the better the color the more rare it is.
Once called bixbite, red beryl is one of the rarest and most desirable gems. With good wearability, this gem can make an excellent jewelry stone — if you can find one! Gem-quality red beryl occurs only in Utah's Wah Wah mountains, and most specimens are kept by mineral collectors and never faceted.
These inclusions reflect light in an effect known as asterism. You can distinguish a synthetic variant from a natural one by analyzing the reflected star from both of them. The one with a near-perfect star is synthetic. Because of its rarity and beauty, black star sapphire is costly and coveted by collectors.
Diamond – The Forever Gem
Diamonds symbolize forever love, which is why they're most commonly given as engagement and wedding rings. Diamonds that surpass the 'z-light yellow' rating on the diamond color scale are considered fancy yellow diamonds.
Tanzanite is one of the many exotic semi-precious gemstones, which also happens to be extremely rare in the world.
Pink sapphires are considered quite rare, but they were once considered far rarer. That is because they were only found in select locations around the globe including Sri Lanka and Myanmar. In the late1990s that all changed with the discovery of pink sapphires in Madagascar.
Black Amethyst is actual Amethyst, with some hematite inclusions, which give the amethyst a black tint, but when looked at through light, you can actually just see that it is violet.
Although quartz is one of the most common minerals on Earth, natural rose quartz is one of the rarer colored varieties of crystalline quartz. Still, it's not an expensive gemstone. The most coveted colors are pure to purplish pink. These colors are hard to find with transparent clarity, instead showing a milky look.
Pink Amethyst is a particularly newly discovered crystal that comes from South America. It's also considered to be a fairly rare stone because it can only be found in a couple locations.
It is said that moldavite crystal was formed as a result of the collision of two celestial bodies around 15 million years ago. Although it's still being mined, most of these mining operations are illegal as moldavite diggers attempt to exploit as much as they can lay their hands on to sell on the black market.
Musgravite was first discovered in Musgrave Ranges, Australia, and later found in Madagascar and Greenland. Musgravite is a member of the taaffeite family of minerals and the separation between the two is based on magnesium content. What makes it so rare? Musgravite is considered the rarest crystal in the world.
The color of natural moldavites is caused by very low concentration of iron; all other tectites are more Fe-rich and therefore black. Fluorescence is particularly helpful because it may be used on large mixed lots. Some imitations are not fluorescent, however.
1. Emerald (May) The lush abundance of spring is mirrored in May's birthstone, the emerald, with its deep green hue, making it the best birthstone of them all. According to legend, emeralds are also a source of great luck and offer protection against evil to those who wear them.
Diamonds are much more expensive than gold. However, red diamonds are extremely rare on our planet. Only 30 of them are currently known, and most of them do not weigh more than half a carat (about 0.1 grams).
Gem-quality rubies are significantly rarer than diamonds, though there are certain types of diamonds that are very rare too. If we weigh the most spectacular examples of rubies and diamonds against one another, diamonds that show color are even rarer.