Rare Pink Tanzanite Crystal For high value gems such as ruby, sapphire, spinel, alexandrite and the rarer garnets, the shape of the rough will usually dictate the shape of the finished gem. Shopping Cart There are no products in your shopping cart.
So quick! I love this apple green colour of this piece of peridot. Thank you. Customer for life. UPS just delivered the custom 1.
Ruby ring. Simple and elegant, just how I like it. I could not be happier. Thank you for your patience answering all my questions and thank you for being friendly, honest and reputable. I also appreciate the insanely fast shipping. Your communication throughout the process put me at ease and the quality and workmanship of the ring are top notch. This Ruby is definitely the right investment choice and will be in my family for many generations to come. Thank you again! Absolutely stunning Scapolite.
Hello Ron, I have been so busy but everything is finally settling nicely, so I can write a proper message expressing my thanks. I am very grateful to you for your frank assessments, patience, and advice about the [ I have seen many cuts for scapolite stones of varying quality, veering between mediocre cuts to precision-brilliance but overly flashy and not to my liking.
I had not found anything that expresses calmness, wisdom and unwavering elegance as I want in a scapolite, until AJS Gems. Love the details, the serenity, the balance, the quiet confidence that is beautifully expressed in the artistry for this custom AJS-cut scapolite gemstone. Absolutely stunning under different lights, because it knows how to shine in a soothing manner without being gaudy or annoying.
Rough gemstones and minerals usually display uneven color distribution that can be caused by different aspects, such as:. Chemical and physical changes in the environment during crystal growth can cause variations of color. The most common cause is variation in the chromophore elements that causes the more or less intense color in different growth zones of the same crystal. In some rough gemstones, color zoning corresponds to different saturation of the same color.
Color zones can be easily seen by the naked eye or visible only under the microscope, color zoning can be wide or narrow. They can be uniformly formed in all directions or have very different thicknesses depending on crystallographic orientation, as a result of unequal growth velocity on different crystal faces.
Commonly the uneven color distribution deeply affects crystal value or quality factors and cutters try to avoid color zoning visible from the crown. However, for some gems i. During the initial stages of crystal formation, the growth sector can be described as a pyramid with the base corresponding to the crystal face and the apex in the center of the crystal. However, in most circumstances, the shapes of growth sectors are more complicated, due to changes in crystal habit.
Different growing levels in crystal structure have different capacities to consolidate impurities. As a result, growth sectors formed by crystals usually have slightly different chemical composition, which will also cause variations of physical properties i. It is also responsible for a special gem variety such as ametrine, where same quartz amethyst and citrine coloration is observed in different growth sectors.
Curiously, synthetic ametrine has color zoning as a mechanism for the formation of two different colors within the same crystal. Irradiation is also one of the most traditional treatments for gemstones, applied to a wide variety of gems to produce or intensify their color. Natural irradiation in many instances causes non-homogeneous coloration because certain parts of the crystal may stay in closer vicinity to the source of irradiation. Such are the cases of green sports on some diamond crystal or black halos around uranium and thorium minerals included inside quartz crystals.
Various types of ionizing radiation can provoke the creation of optically active centers in minerals changing their color. Radioactive decay in mineral deposits is the reason for naturally occurring blue topaz, green diamonds, smoky quartzes, etc.
Type of Raw Gemstones Deals we Have. A gemstone in its natural form which is not yet polished, faceted, cabbed, carved, tumbled or cut will be called a rough stone or a raw gemstone. They will be exactly like they were made by mother nature. Rough gemstones are usually analyzed by good Color, Good Shape, Good Size, and Good Clarity which are normal desirable traits in rough gemstones.
It also depends on customer demand. If you are faceted, you would like to see color, clarity, and size. If you are making gemstones on an industrial level in form of tumbling, cabbing, carving, you will go for Color, size only but supply and constant quantity will be your first choice.
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