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Fracture FilledSmall cracks or fractures in a gemstone can interrupt the passing of light through the stone, creating white or "dead" spots in the color of the stone. Sometimes these fractures – if they reach the surface of the stone – will be filled with material that allows the light to pass through smoothly. Various materials are used for this; oil, wax, glass, epoxy, and borax are common materials. These tiny filled cavities are difficult to see with the naked eye, so buyers should be aware of this practice. The most commonly filled stones are emerald, aquamarine, ruby, sapphire, peridot, and turquoise. It is accepted for emeralds to be oiled, as they are naturally heavily fractured. 
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The process of fracture filling ruby with transparent lead glass is a recent innovation that began around 2004 in Chanthaburi, Thailand. Rubies of good color, primarily from Madagascar, that are disfigured by fissures or surface cracks can be "repaired" using heat treatment with lead glass. The refractive index of corundum and lead glass are very similar, therefore, light can travel through the stone unhindered, thus improving the color and clarity. These rubies are often found in large sizes at a fraction of the cost of similar colored untreated ruby. So they are of excellent value, as long as the treatment is disclosed and the price is appropriate. The Asian Institute of Gemology tested fracture-filled rubies for durability and found them to be more durable than a typical fractured emerald that has been filled with oil or resin. AIGS advised against excessive heating with a jeweler's torch, but found no negative effects from cleaning with detergents or ultrasonic devices. They advise that hydrofluoric acid should not be used on these gems, and that any recutting or repolishing should be performed with care.
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Overall Rating -> 10 Gemselect is the perfect site for all your precious stones to buy Posted By Nate in October, 2022 Source: Bizrate Overall Rating -> 8 I ordered peridots online and they were very close to the shade in the photo. They had a good polish and pretty good lapidation for a commercial cut. They had the correct critical angles for the ri of the material so that the stones had life in them. The down side was the lack of tracking and the length of time that it had taken to get them. Posted By Montecarloman83 in January, 2023 Source: Bizrate Overall Rating -> 10 I have been looking for a good place to buy gem stones for my girlfriends engagement ring and this site has stones I didn't even know existed. They have all the stones I need to bring her ring to life. Posted By Sean T in February, 2023 Source: Bizrate Overall Rating -> 10 Excellent prices, excellent gemstones, easy to navigating, at the checkout, only a part of my cart was paid, then I get back to my chart, and the missing gemstones were there, so I pay it.At the end of the day, I did 2 consecutive purchases, paying 2 shippings. But even with that issue, I’m sure that worth it.Thanks! Posted By JPL in April, 2023 Source: Bizrate Related Articles Gemstone Treatments All About Gemstone Treatments - Information - GemSelect ... Gemstone Prices Gemstone Prices - A review of what influences the amount you pay ... Fracture-filled Ruby Fracture-filled Ruby ... Emerald Treatments Emerald Treatments ... |
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Size and Weight
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Gems are always measured in Millimeter (mm) Dimensions are given as; Select gems by size, not by weight! Note: 1ct = 0.2g  |
