Open FREE Unlimited Store Join Our Newsletter Dr. Shihaan M. Larif Origin of Name The Abernethy Pearl, a 44-grain extraordinary freshwater pearl discovered in the River Tay in Scotland from a freshwater Unionoidae mussel species known as Margaritifera margaritifera, once common in the rivers of Scotland, gets [...]
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Marilyn Monroe Pearl Necklace Mary Todd Lincon’s Seed Pearl Jewelry Suite Maharani Jindan Kaur Emerald and Seed Pearl Necklace Melo Melo Pearls Michael Jackson’s Victory Tour Pearl and Crystal Studded Costume Shirt Multi- Gemstone, Diamond & Cultured pearl fringe necklace & earrings Natural Black Pearl Ring Natural Pearl, Diamond and Ruby Pendant Necklace Natural Pearl [...]
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Important tables on famous pearls of the world Abernethy Pearl Anna Thomson Dodge/ Catherine The Great Pearl Necklace Anne Boleyns Pearls Antique Natural Pearl & Diamond 5 Row Necklace Aphrodite Pin Arco Valley Pearl Antique Pearl and Diamond Pendent Brooch Barbara Hutton / Marie Antoinette Pearl Necklace Bao Dai/ Sunrise Pearl- Worlds Largest and Roundest [...]
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Famous Diamonds. (See Below) Famous Diamond and Jewelry Collections Famous Gemstones More Famous Gemstones More Famous Diamonds Famous Pearls of the World More Famous Pearls Agra Diamond Ahmedabad Diamond Akbar Shah-Jahangir Shah Diamond Allnatt Diamond Amarillo Starlight Diamond Amsterdam Diamond Archduke Joseph Diamond Arcot Diamonds Ashberg Diamond Beau Sancy Diamond Begum Blue Diamond Black Orlov [...]
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1.Important factors that determine the price of a gemstone are:- (i) The type of gemstone. (ii) The size of the gemstone. (iii) The type of cut employed. (iv) The color of the stone-whether the color is light or dark; Whether the color is even and dispersed throughout the stone. (v) [...]
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Criteria used in determining country of origin of blue sapphires Identification of inclusions is the first criterion used by gemologists in determining the country of origin of a blue sapphire.The presence of inclusions that are unique to certain sapphire producing regions, can be easily used in identifying the source, eg. the presence of needle-like pargasite [...]
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Gemstone Drilling Machine Gemstone Drilling Machine The gemstone drilling machine is useful in making beaded gemstone necklace, earrings and other jewelry items. One should always wear safety glasses when using a gemstone drill. The drill should be held perpendicular to the stone. A wrong angle can causecracking at the entry or exit point. Gemstone Drilling [...]
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Ring Sticks Ring Sticks Ring sticks comes in various standard sizes such as for U.S.A scale, Indian scales and European scales. Ring Stick Photo above,C.C Ring stick with U.S scale and diameter in mm. Photo above,C.C Ring sizes and ring sizing will be covered on a dedicated page. Ring Sizers Ring Sizers Ring sizers also [...]
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Click here to go to Part III 12) Electronic Diamond Tester There are many different types of electronic diamond testers in the market. Electronic diamond testers are portable and battery powered Presidium Electronic Diamond Tester All electronic diamond testers test the ability of the stone to conduct heat. That is they test the thermal conductivity. [...]
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Click here to go to Part II Part III of the introduction to instruments used in gemology covers microscopes, ultraviolet lamp, heavy liquids, hardness pencils and weighing scales. 7) Microscopes Kruess Optronic Diamond and Gemstone Microscope with inbuilt fiber optic light source.This microscope can be used for gemstone analysis with immersion technique. The microscope is probably [...]
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In part II, I will cover four instruments dichroscope, chelsea color filter and polarascope. Click here to go back to Part 1 4)Dichroscope Transparent gemstones may be tested using a dichroscope. A dichroscope is a portable pocked instrument used by gemologists. It is very useful especially in the feild. Dichroscopes can be used for both rough and [...]
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I have put this topic under ‘Guide to Buying Diamonds & Jewelry’, for buyers that are curious to know what happens behind the scene in a gemological laboratory. Diamond and jewelry buyers can also learn about the commonly used tools by jewelers and dealers. Please do not confuse gemmological instruments with tools and accessories used in gemmology [...]
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One should be careful when using the term ‘diamond cut’ as gemmologists use this term to refer to the proportions of the diamond such as width, depth and symmetry of the facets. In other words it refers to the quality of the ‘cutting & polishing’ of the diamond which is covered in my article Cut of [...]
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1) Sealed Diamond Reports Many laboratories these days provide a diamond sealing service after the diamond is tested. A sealed diamond report by the International Gemological Institute (IGI). Usually upon request the stone is sealed together with a reduced copy of the diamond report. This assures the consumers, diamond dealers, jewelers and other professionals in [...]
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Dr Shihaan Larif Part 1 A diamond grading certificate is defined as a document which proves that some of the physical properties of the diamond has been tested by professionals in an independent laboratory. Nowadays most individuals who shop for diamonds ask for diamond certificates before buying the stone. This is a very good trend [...]
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In this section I will cover the answers to frequently asked questions asked by our clients, before they buy diamond jewelry. 1) Is it important to learn, educate yourself and ask questions about diamonds before you buy? Try to learn as much as you can about diamonds before buying. It is important to learn about [...]
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The term clarity of a diamond refers to the size and the number of inclusions in the diamond. The inclusions are also referred to as inperfections of the diamond. Tiny inperfections occur in almost all natural diamonds. These flaws are present due to the incredible amount of pressure during the formation of the diamond billions [...]
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Introduction to Colored Diamonds and Color Grading of Diamonds The color grading of diamonds is one of the important 4 c’s that forms the basic foundation for diamond grading and evaluation. Here, when we talk of diamond color grading we are referring to the color grading of white and yellow diamonds and not color grading [...]
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Please upload images of the rough grey diamond and give more details such as the carat weight of the stone, the mine-of-origin, country-of-origin, a description of the rough stone, any document certifying that the grey stone is a diamond etc. that may be helpful in evaluating the price of the stone.
The image of the white rough stone uploaded by Guru is definitely not a diamond. Diamonds are not found in Sri Lanka, even though the country is blessed and has almost 75 varieties of gem minerals out of the nearly 200 recognized gem minerals found around the world. Main varieties of gem minerals found in Sri Lanka are Corundum (blue sapphire, ruby, pink sapphire, yellow sapphire, padparadscha, white sapphire, star sapphire, star ruby, geuda sapphires), Chrysoberyl (yellow to green chrysoberyl, catseye chrysoberyl, alexandrite, cat's eye alexandrite), Beryl (aquamarine), Spinel (the most abundant gem mineral found in Sri Lanka - The range in color of Sri lanka spinels are ruby red, pink, orange, shades of reddish brown, purple, blue, bluish green, mauve, greenish black, black to colourless), Garnet (Alamandine, Pyrope-Rhodolite, Spessartine, Grossular-Hessonite), Tourmaline (common colors found in Sri Lanka - yellowish green, dull green, honey yellow brown and rarely blue and bright green. Most abundant yellowish-brown), Quartz (purple-Amethyst, yellow/orange-Citrine, rose quartz, white quartz, brown quartz), Topaz (white), and Feldspar (Moonstone).
The varieties of white gem minerals found in Sri Lanka are white sapphire, white spinel, white quartz, white topaz, white zircon known as Matara zircon and white moonstone. Hence the white rough stone you have uploaded can be any one of these white gem minerals.
Sapphires have a hexagonal bipyramidal crystal habit as seen in the image of a white sapphire mined in Sri Lanka. However most sapphires mined in Sri Lanka have lost this hexagonal bipyramidal shape due to erosion caused over millions of years. The image of the rough stone you have uploaded (Images 3 and 4) have a pyramidal shape at least on one side of the stone and may be an indication that it is a white sapphire.
All varieties of colored spinels are quite abundant in Sri Lanka, but white spinels are very rare. Hence, it is highly unlikely that the rough gemstone is a white spinel. Moreover the crystal habit of spinels are octahedral which is not what is seen in the image.
White milky quartz is commonly found in Sri Lanka, and have a shiny appearance like the rough stone you have uploaded. However, because of their cloudiness and opaqueness such quartz stones have no gem value and are not used as gemstones. The crystal habit of quartz is six-sided prism terminating with six-sided pyramids at the ends, like sapphires. Hence the image you have uploaded may be of a milky quartz crystal.
Colorless and white topaz is also quite common in Sri Lanka. Topaz also forms prismatic crystals ending sometimes in pyramidal faces. However, the type of milkiness found in the image is highly unlikely to be that of topaz.
Colorless zircon known as "Matara Zircon" mined in a village in the Matara District of Sri Lanka, is well known in the international gem trade. When cut and polished the "Matara Zircon" has a brilliance and fire very similar to natural diamonds and was known in the trade as "Matura Diamonds." Crystals of zircon are tetragonal or square prismatic and dipyramidal. Comparison of the giant white zircon crystal discovered in Embilipitiya with the image of the rough stone uploaded, shows that the unidentified rough stone is highly unlikely to be Zircon.
White moonstone is common in Sri Lanka, and the image of a white moonstone from Meetiyagoda, Sri Lanka shows that it is not morphologically similar to the image of the white rough stone uploaded by Guru. The moonstone gets an opalescent luster only after cutting and polishing, usually as a cabochon.
Hence the rough white stone uploaded by Guru is most likely to be a milky quartz crystal or a white sapphire rough stone.
