Welcome to the Gemstone page
Welcome to the Gemstone page
Gemology is the science dealing with natural and artificial gemstones materials .It is a geosciences and a branch of mineralogy. some jewelers (and many none jewelers) are academically trained gemologist and are qualified to identify and evaluate gems.
Cuts Of Diamond And Other Colored Stones.
10 Most Rarest Gems In The World Updated 2020
5. red beryl
7. Black opal
Four most precious gemstones
Bonus entry: salt water pearl.
Cut of Diamond
The precision and delicacy with which your diamond is cut will determine its brilliance, its fire and its ultimate beauty.
The shape you select is a matter of individual taste, and the choice available will depend on the skill and imagination of the craftsman. While the round brilliant is the most popular choice, there is a wide variety of alternative shapes that range from the traditional marquise, pear, emerald, oval, baguette, princess or heart, to the more fanciful and creative.
The round brilliant is the most popular of all the polished diamond shapes.
The oval is an adaptation of the round brilliant and appears larger than a round stone of the same carat weight.
The marquise is the name given to a diamond that is long and pointed at both ends.
The heart is perhaps the most romantic of what are known as the fancy shapes.
The emerald cut diamond is rectangular, with oblong facets on each side and across the corners.
The pear shape is the English name for the French ‘pendeloque’ which is related to our word pendant.
The princess cut creates a bright and scintillating look.
A cousin of emerald, aquamarine and morganite, the red variety of beryl contains manganese, which imparts a bright red hue. 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.
This rare stone exceeds diamond’s rarity as well as its “fire” or dispersion. Combined with its often sapphire – blue color, its no wonder this is a highly sought rare gem. Gem – quality benitoite occurs only in San Benito County, California (and thus a natural choice for the California state gem). When choosing a Benitoite gem, consumers must decide between a dark and saturated sapphire blue with somewhat less visible dispersion or a gem with a lighter tone but sparkling fire.
There are more rare gemstones if you wish to learn more.
Black Opal, Padparadscha sapphire, Russian demantoid, Oregon Sunstone moldavite and Larama .
Intense violet-blue hues of Tanzanite can rival fine Sapphire at a fraction of the price, and it’s a much rarer stone! Occurring only in a small area of Tanzania, this variety of zoisite has become quite prominent. After its discovery in 1967 by John Saul
It quickly rose in popularity due in part to the marketing efforts of Tiffany & co. This stone shows strong pleochroism, appearing blue violet or green-yellow to brown, depending on the viewing angle. Gem cutters orient these gems to enhance the blue or violet hues. Though almost all Tanzanite undergoes heat treatment to produce its attractive blue hues, this treatment produces a stable color that makes this stone so desirable.
All rubies are rare, but those from Myanmar (formerly Burma) set the standard for quality and colour. They are also exceptionally scarce. While rubies from Thailand contain relatively high iron content, which can result in overly dark reds with brownish or purplish overtones, the geological conditions in Myanmar generally produce rubies with tittle trace of iron.
As a result, these gems often archive more vivid reds with much stronger fluorescence than their Thai counterparts. Still, a top-quality Thai ruby will rival the finest from Myanmar with fine colour nicknamed “pigeon blood” these red gems are always in demand.
known for the bright electric green of imperial jade, Jadeite can actually occur in many colours, including lavender, yellow, orange, red, blue, black and colourless, Highly prized in Chinese Mayan and Maori cultures, this stone has an extensive body of folklore.
Jadeite value depends on its translucence and texture with top quality material appearing to be full of water. or Like a drop of coloured oil, still determining the price of a piece of jade involves more objectivity than most gemstones. The artistry of the piece plays a very important role. These a Chinese saying: Gold has value; jade is invaluable.
Discovered in 1830 in Russia’s Ural Mountains, Alexandrite has remarkable colour-changing abilities. Due to trace amounts of chromium in the crystal structure, this stone appears emeralds green to peacock blue in daylight but ruby red to amethyst under incandescent light. At the time, imperial Russia’s colors – red and green – were in style. Thus, it’s no wonder that the Russian aristocracy coveted this stone, named after Cazar Alexender, this variety of chrysoberyl still on rare stone. However, the discovery of Alexandrite in Brazil and a few other locations have expended. This gems availability, it remains among the rarest stones. A modern June birthstone, alexandrite remains popular and is often synthesized for jewelry use.
The brightly saturated blue-green hues of Paraiba tourmaline stunned the gem world in the 1980s. Its discovery in the Brazilian state of Paraiba spurred a rich of prospectors and miners into the area. The per-carat price of these gemstones rises quickly and continues to grow. However, Brazil isn’t the only source of these neon stones. Similar geological conditions produced these copper-bearing gems in Mozambique and Nigeria. Still, this tourmaline variety remains among the rarest gems.
In 1981, the world jewelry confederation (ccibjo) declared ammolite a new organic gem. Occurring in limited deposits in the kooky mountains, This gem material is much rarer than diamond. Ammolite is made of aragonite shell of marine mollusks more than 65 million years old, which display bright iridescent colors. Any colors of the rainbow or even the entire rainbow may appear in a single specimen. Those unique gems’ value increases for rare colors, more intense irides and play of color and how much the stone can be rotated with the color still visible. Today, korite international mines most of the ammolite on the market.
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Pearls are ubiquitous, but without the cultured pearl industry, they would be nearly non-existent. Natural pearls are extremely rare. And becoming rarer every year. Due to overfishing, pollution and ocean acidification, naturally accruing pearls appear more frequently in antique jewellery than in our planet’s oceans. Natural Pearls are rarely round and often off colour. So, while the standard for matching round pearl jewellery is very high in cultured pearls, natural pearl strands will have more imperfections.