In the 18th century the chemical composition and structure of gemstones has become of Tanzanite is not for everyday use, and care must be taken when wearing. Avoid State: nNeuf without packaging: Subject nine never worn lemballage sold without original or a portion of the original post is missing Packing material as the box or cover original post. Dorigine labels may not be attached. For example a pair of brand new shoes without the box without dusure original post falls into this category. The rare blue gems worn as ornaments ring, pendant, bracelet and necklace pieces are stunning report. However, most opal tanzanite ring need extra care and protection. As a collector of gems are usually defined by beauty, rarity and durability, these stones have responded to the need to some degree. However, most of those gemstones that are softer gemstones best known and most popular, such as sapphire and diamond. In fact, it is their relative fragility that makes many of these few extra gems and stones as coveted jewelry. In addition to their overall shortage is the difficulty in the rough shape of precious stones (due to the fragile, hard to split, size or other characteristics) makes these particularly rare jewels. Fortunately, if you want the blue rare and beautiful gems jewelry collector of your own, there are many normal blue gemstones which to choose. Although imitations exist for some of these gems, all collectible gemstones listed here are normal, non-synthetic or treated stones copier. Although the diamond is not relatively rare blue diamond of gem quality is quite rare. The hardest of all gemstones, evaluated 10 of the Mohs hardness scale, diamond has a particularly high refractive index and is known for his brilliant, beautiful luster and fire. Diamond is safe and suitable for all types of jewelry. In the best case, the color should be deep enough to be evaluated by the fantasy Gemological Institute of America (gross internal area). Although not as collectible and beautiful diamonds can be had as well in the range light blue. The inclusions are more common in the colored diamond in the near-colorless diamond, however, a blue diamond eye-clean, if you can find it, is preferred. Expect to pay a high price for the blue diamond natural and untreated. Many blue diamonds that are advertised as normal, are natural stones that have been processed for color. If the price seems too good to be true, it probably is a natural diamond that has been treated artificial. In general, the blue sapphire is abundant and a native of many places around the world. However, the rough materials from Kashmir, India, is considered the finest sapphire. It is also the rarest. What makes Kashmir sapphire stand out from the other is the powdered material originating extraordinary gem, velvet-like, blue-looking blue violetish. In addition, the gems show no softly green as often found in blue sapphire. Kashmir stones have few dark areas of extinction and highly saturated colors look good in any type of lighting. An expert was quoted saying that the Kashmir sapphire can cost from 300 to 400 percent more than sapphire of other origins. Kashmir sapphires are extraordinarily rare, started operation in the late 1880s and was almost complete by 30 years. Since then, only sporadic operation took place. Mohs evaluated 9, sapphire is a doubly refractive gemstone very dignified and durable for jewelry. Spinel shares many characteristics with the sapphire. Gems have a similar mineral makeup, and are often from the same places. However, the spinel is much rarer than the sapphire. In addition, spinel may seem more transparent and brilliant as sapphire. Moreover, unlike the sapphire is often treated to clean and intensify the color, blue spinel is never treated. However, spinel may not be as intense in color than sapphire. Like diamond, spinel has a brilliant cubic crystal system and is separately refractive. The best blue spinel is saturated and pure colors. Large stones are quite rare, especially in rounded shapes. Mohs spinel and evaluated 8, is a hard stone jewelry and is safe for most options jewelry and cleaning. Most blue topaz launched on the market for jewelry topaz is colorless normal which was submitted to heat treatment and / or irradiated to the color blue. However, when you can find the rare natural blue topaz is a stunning and highly collectable gemstone for jewelry. Unfortunately, it is almost impossible to tell if a stone has been treated or not. The Topaz trichroism shows the low and is doubly refractive. The normal topaz is very soft, hard (Mohs 8), bright, relatively clear and has excellent color range of blue. However, the trend of the stone to develop breaks may make him vulnerable to cut, place, and the handle. Avoid ultrasonic cleaners and cook, heat strong, rough handling and rapid temperature change. Regardless of origin, tourmaline glowy continues to be extremely rare because the gems are found only in copper-rich regions (color is brassy gem, irons and manganese). These areas are painstakingly extracted by hand with hand tools out of small, pencil-thin veins in the earth. Always the most expensive per carat, Paraiba Brazil tends to be smaller, while the African material can reach over 5 carats. Prices were as high as $ 60, 000 per carat for gem intensely colorful and glowy. The Paraiba tourmaline shows moderate to strong pleochroism which is usually light to dark tones of the same key. The Mohs hardness is 7-7. 5. Sudden changes in heat should be avoided to prevent rupture and ultrasound are not recommended. The blue beautiful, abundant, deep hues of violet-blue tanzanite gems above are second to none. In fact, at a fraction of the price, we think the finest tanzanite by many to surpass the sapphire superior in terms of color quality. Moreover, the tanzanite is 1, 000 more times that rare diamond. However, less known is the fact that tanzanite, which is a series of zoisite can be a relatively fragile gemstone. Evaluated just six. 5 on the Mohs scale, tanzanite gem is considered a fragile if not protected can chip easily. In addition, cleavage perfect tanzanite makes it vulnerable to bumps and knocks. In addition, most tanzanite gem started the brown color and was subjected to heat treatment to highlight the color blue. Fragile gem of increased heat treatments. Tanzanite is highly transparent and generally a very clean stone. It is pleochroistic, so it will show different colors when viewed from different angles. Larger stones tend to show more depth of color, unlike sapphire which can show very intense colors in smaller stones classified. Tanzanite is estimated Mohs 6-7. Zoisite was originally discovered in Tanzania. Kenya is also a source. Experts say that the sources for Tanzanite is extremely limited, making this a truly collectible gem. Stones should be placed carefully, the ring stones for the benefit of protective arrangements. Ultrasonic cleaners should not be used. Discovered in San Benito County, CA, in 1906, extraordinarily beautiful, single-source benitoite continues to be one of the rarest gemstones in the world. Indeed, many experts rank him one of the three main stones rarest. Mohs evaluated 6-6. 5, the wearability of Fine benitoite blue is good enough. In addition to the pink hues colorless and very few less well known, the benitoite usually is clear blue or violet-blue and shows such a high gloss and excellent dispersion that can be confused with the blue diamond. In addition, the gem may be confused with the blue sapphire, although benitoite dichroêque is strongly and shows a ray without color (in addition to a blue ray), which is not present in the sapphire or diamond. Difficult to source in sizes over one carat, it was reported that only a handful of larger stones benitoite are produced every year. A gem of any weight is expensive. Gems should be mounted in the protective arrangements. Ultrasound are not recommended. Acids and rapid temperature changes should be avoided. Once you've seen a good specimen of hauyne the hau'-spoken ween, you will never forget this gem that attract the eye and electric-blue. From a small region in Germany, interest in this extremely rare gem and electric-blue collector is on the rise. Discovered in ancient ruins, the stone has been known since Roman times. No other gem n'assortit hauyne the unique, pure and intense blue color mid-green-blue alert. The transparent material is particularly rare as faceted. Hauyne is part of the sodalite group and is a mineral constituent of lapis lazuli. Like diamonds, hauyne has a cubic crystal and is separately refractive. Mohs evaluated 5. 5-6, the faceted stones are extremely rare because the perfect cleavage of the gem material is prone to rupture. The hauyne faceted cut is usually quite small and bright, although expensive. Material more than 5mm is almost impossible to obtain. Since it is fragile, the hauyne should be protected when handled and resolved. Ultrasonic and steam cleaners should not be used. The kyanite is an aluminum silicate which is a little known gem of interesting jewelry. Gems upper kyanite show a startling blue. What is particularly interesting is the gem that it almost always shows the zoning or inequality of color. Once operated by a skilled cutter, this two-tone makes for a stunning gemstone and one-of-a-kind. Another unusual feature is the variable extreme hardness of the stone. Put in parallel to an axis in the crystal gem evaluates about Mohs 4. 5. However, on the axis perpendicular to the hardness is 6. 5. This prepares the kyanite extremely difficult to cut, and faceted gemstones of kyanite are extraordinarily rare. Moreover, few rough kyanite is transparent and clean enough for faceting begins, making the material extremely rare gem. The kyanite is sensitive to heat. The arrangements of jewelry should be somewhat protective, and cook with steam and ultrasonic cleaners should not be used. The kyanite may be confused with aquamarine, the benitoite, sapphire and tourmaline.