New Editor's Corner
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
THE CUTTING PROPERTIES of KUNZITE by John L
THE CUTTING PROPERTIES OF KUNZITE By John L. Ramsey In the process of cutting l~unzite,a lapidary comes THE PROBLEMS OF PERFECT CLEAVAGE face-to-face with problem properties that sometimes AND RESISTANCE' TO ABRASION remain hidden from the jeweler. By way of ex- amining these problems, we present the example of Kunzite is a variety of spodumene, a lithium alu- a one-kilo kunzite crystal being cut. The cutting minum silicate (see box). Those readers who are problems shown give ample warning to the jeweler familiar with either cutting or mounting stones to take care in working with kunzite and dem- in jewelry are aware of the problems that spodu- onstrate the necessity of cautioning customers to mene, in this case kunzite, invariably poses. For avoid shocking the stone when they wear it in those unfamiliar, it is important to note that kun- jewelry. zite has two distinct cleavages. Perfect cleavage in a stone means that splitting, when it occurs, tends to produce plane surfaces. Cleavage in two directions means that the splitting can occur in The difficulties inherent in faceting lzunzite are a plane along either of two directions in the crys- legendary to the lapidary. Yet the special cutting tal. The property of cleavage, while not desirable problems of this stone also provide an important in a gemstone, does not in and of itself mean trou- perspective for the jeweler. The cutting process ble. For instance, diamond tends to cleave but reveals all of the stone's intrinsic mineralogical splits with such difficulty that diamonds are cut, problems to anyone who works with it, whether mounted, and worn with little trepidation. -
ULTRA TEC LAPIDARY EQUIPMENT PRICE LIST January 1, 2014
ULTRA TEC LAPIDARY EQUIPMENT PRICE LIST January 1, 2014 Order Code Description List Price ($US) 1,0 ULTRA TEC CLASSIC FACETING MACHINES 1607.5CDR V5 Faceting Machine - Classic - Digital Angle Display - right-side Mast 4,950 1607.5CDL V5 Faceting Machine - Classic - Digital Angle Display - left-side Mast 4,950 1607.52CAR V5 Faceting Machine - Classic - Analog Angle Dial - right-side Mast 4,490 1607.5CAL V5 Faceting Machine - Classic - Analog Angle Dial - left-side Mast 4,490 1607.2CDR V2 Faceting Machine - Classic - Digital Angle Dial - right-side Mast 4,590 1607.2CDL V2 Faceting Machine - Classic - Digital Angle Dial - left-side Mast 4,590 1607.2CAR V2 Faceting Machine - Classic - Analog Angle Display - right-side Mast 3,950 1607.2CAL V2 Faceting Machine - Classic - Analog Angle Display - left-side Mast 3,950 ALL V2 and V5 machine orders include: - Base - operates at 110 or 220 VAC - Mast - 96 Index Gear - Driptank - Transfer Fixture - Tabling Adapter (45 degree) - Set of 12 Dops (4, 5, 6, 8mm F.V.C.) - Set of Wrenches - Drain Hose - Owner's Manual 1.1 Classic Faceting Machine Accessories and Upgrades and Modifications STANDARD MACHINE ACCESSORIES 1501.7 Faucet Kit 119 1301.7 Lamp 82 1581.7 Dust Cover 48 1905.32 32 Index Gear 64 1905.64 64 Index Gear 64 1905.72 72 Index Gear 64 1905.77 77 Index Gear 72 1905.80 80 Index Gear 64 1905.96 96 Index Gear 64 1905.120 120 Index Gear 86 1905.678 Index Gear Set (64, 72, 80) 172 1 of 10 ULTRA TEC LAPIDARY EQUIPMENT PRICE LIST January 1, 2014 Order Code Description List Price ($US) SPECIAL PURPOSE -
2014 – 2015 Catalog Diamond Some of the Many Manufactures We Wheels Stock and Represent: Laps Ameritool Disks Compound Barranca Drill Bits Tumblers Covington
Price MLS $1.00 Minnesota Lapidary Supply “YOUR LAPIDARY SUPPLY GENERAL STORE” America’s Supplier of Quality Lapidary Products FOR OVER 50 YEARS!!!! 2014 – 2015 CATALOG DIAMOND SOME OF THE MANY MANUFACTURES WE WHEELS STOCK AND REPRESENT: LAPS AMERITOOL DISKS COMPOUND BARRANCA DRILL BITS TUMBLERS COVINGTON DIAMOND PACIFIC DONEGAN OPTICAL SAWS EASTWIND ESTWING The M.L.S. The ROCK STORE FOREDOM WAREHOUSE GRAVES GRYPHON HI-TECH DIAMOND KEYSTONE ARBORS ABRASIVES LAPCRAFT LORTONE LOT-O-TUMBLER MK DIAMOND MLS Sun. & Mon. ------- Closed Tue. thru Fri. ----- 9:00 am to 5:30 pm (CST) RAYTECH Sat. ------------------ 9:00 am to 4:00 pm (CST) REENTEL SAW BLADES OPEN ALL YEAR LONG!!!! TRU-SQUARE ALL PRICES ARE SUBJECT TO CHANGE WITHOUT NOTICE ANY PRINTING ERRORS ARE SUBJECT TO CORRECTION MLS MLS Trademark Registered - Minnesota Lapidary Supply Minnesota Lapidary Supply 201 N. Rum River Drive Princeton, MN 55371 Ph/Fax: (763) 631-0405 email: [email protected] TOLL FREE ORDER PHONE: (888) 612-3444 WEB SITE: www.lapidarysupplies.com “YOUR LAPIDARY MLS Order Toll Free: (888) 612-3444 GENERAL STORE” Minnesota Lapidary Supply Web Site: www.lapidarysupplies.com Dear Customers, Please meet the staff: “JOSEPHINE & VAL” “DEE” “JEN” SALES ASSOCIATE ROCKS and Things SHIPPING & OWNERS RECEIVING These are the people you will be talking to when you call in or stop by. As you can see from this our latest catalog, we have expanded. There is so much new lapidary equipment and supplies on the market it was just time to expand our offerings. So to, since I acquired the business 9 years ago, we have grown. -
United States Facetors Guild Newsletter
UNITED STATES FACTORS GUILD NEWSLETTER VOLUME 26, NUMBER 1, MARCH 2016 UNITED STATES FACETORS GUILD NEWSLETTER 1 UNITED STATES FACTORS GUILD NEWSLETTER VOLUME 26, NUMBER 1, MARCH 2016 ........................................................................................................................ 3 ...................................................................................................................... 4 .............................................................................................................. 5 ...................................................................................................................................... 6 .................................................................................................................. 6 .................................................................................................................................... 12 ........................................................................................................................................ 13 .......................................................................................................... 16 .................................................................................................... 18 ..................................................................................................................................... 21 ....................................................................................................................................... 24 -
Evaluation of Brilliance, Fire, and Scintillation in Round Brilliant
Optical Engineering 46͑9͒, 093604 ͑September 2007͒ Evaluation of brilliance, fire, and scintillation in round brilliant gemstones Jose Sasian, FELLOW SPIE Abstract. We discuss several illumination effects in gemstones and University of Arizona present maps to evaluate them. The matrices and tilt views of these College of Optical Sciences maps permit one to find the stones that perform best in terms of illumi- 1630 East University Boulevard nation properties. By using the concepts of the main cutter’s line, and the Tucson, Arizona 85721 anti-cutter’s line, the problem of finding the best stones is reduced by E-mail: [email protected] one dimension in the cutter’s space. For the first time it is clearly shown why the Tolkowsky cut, and other cuts adjacent to it along the main cutter’s line, is one of the best round brilliant cuts. The maps we intro- Jason Quick duce are a valuable educational tool, provide a basis for gemstone grad- Jacob Sheffield ing, and are useful in the jewelry industry to assess gemstone American Gem Society Laboratories performance. © 2007 Society of Photo-Optical Instrumentation Engineers. 8917 West Sahara Avenue ͓DOI: 10.1117/1.2769018͔ Las Vegas, Nevada 89117 Subject terms: gemstone evaluation; gemstone grading; gemstone brilliance; gemstone fire; gemstone scintillation; gemstone cuts; round brilliant; gemstones; diamond cuts; diamonds. James Caudill American Gem Society Advanced Instruments Paper 060668R received Aug. 28, 2006; revised manuscript received Feb. 16, 8881 West Sahara Avenue 2007; accepted for publication Apr. 10, 2007; published online Oct. 1, 2007. Las Vegas, Nevada 89117 Peter Yantzer American Gem Society Laboratories 8917 West Sahara Avenue Las Vegas, Nevada 89117 1 Introduction are refracted out of the stone. -
Carat Weight It's the Old Quandary. Is Bigger Better? Size Is Sought After, Naturally; but Overall Quality Counts in the Stretch
Carat Weight It's the old quandary. Is bigger better? Size is sought after, naturally; but overall quality counts in the stretch. This balance of size and quality makes up much of the art of a professional gem cutter. It is the cutter's job to produce a gorgeous diamond while giving the consumer the highest CARATAGE for his or her money. Caratage means CARAT, the measurement used to weigh a diamond. The word carat is taken from the perfectly matched carob seeds that people once used in ancient times to balance scales. So uniform in shape and weight are these little seeds that even today's sophisticated instruments cannot detect more than three one-thousandths of a difference between them. Don't confuse it with KARAT, the method of determining the purity of gold. What's The Point? One Carat= 200 milligrams, or 0.2 grams. 142 carats adds up to one ounce. Carats are further divided into points. Carat Weight point system What does all this mean, and how does it work? The price of a diamond will always rise proportionately to the size of the stone. Larger diamond crystals are more rare and have a greater value per carat. So, a one carat diamond of a given color and clarity will be much more valuable than 2 one half carat diamonds of equal quality. Cut As the single human contribution to a polished diamond's beauty, cut is perhaps the most important, yet most over-looked, of the Four Cs of diamond quality. How does cut affect a diamond's value and beauty? A good cut gives a diamond its brilliance, its dispersion, its scintillation-in short, its life. -
Cut Shape and Style the Diamond Course
Cut Shape and Style The Diamond Course Diamond Council of America © 2015 Cut Shape and Style In This Lesson: • The C of Personality • Optical Performance • The Features of Cut • The Round Brilliant • Classic Fancy Shapes • Branded Diamond Cuts • Shape, Style, and Cost • Presenting Cuts and Brands THE C OF PERSONALITY In the diamond industry the term “cut” has two distinct meanings. One is descriptive. It refers to the diamond’s shape and faceting style. The other relates to quality, and includes proportions, symmetry, and polish. Most customers are familiar with only the first meaning – cut shape and style. That’s the aspect of All sorts of cutting shapes are cut you’re going to examine in this lesson. The next possible with diamonds. lesson explores the second part of this C. For many customers, cut shape and style is part of their mental image of a diamond. Shape contrib- utes to the messages that a diamond sends about the personality of the one who gives or wears it. When presenting this aspect of cut, you need to match the images and messages of the diamonds you show with the customers you serve. With branded diamond cuts, you may need to explain other elements that add appeal or value. When you’ve accomplished these objectives you’ve taken an important step toward closing the sale. The Diamond Course 5 Diamond Council of America © 1 Cut Shape and Style Lesson Objectives When you have successfully completed this lesson you will be able to: • Define the optical ingredients of diamond’s beauty. • Describe diamond cuts in understandable terms. -
Making Measurements and Using Testing Tools for Specific Properties of Gem Materials Gemstones Are Very Small and Hold Concentra
Making Measurements and Using Testing Tools for Specific Properties of Gem Materials Gemstones are very small and hold concentrated wealth. To correctly identify a cut gemstone may in some instances be much harder than trying to identify a piece of rough material. Many gemstone crystals in rough materials have characteristic crystal shape, cleavage, or fracture, but often you can’t see these properties in cut materials — color, density, luster, reflectivity, heat conduction, magnification, and optical properties are ways to look at cut stones non-destructively and identify them. In this lab we will work with some larger stones and make measurements, Such measurements will be applied to specific stones when we learn gems in a systematic way (as we did with minerals) doing individual groups in labs devoted to them. But for now our goal is to learn the instrumentation, including the names and the parts of the instruments. Importantly, we will learn how to handle the testing equipment in a consistent and practical way so as to avoid any damage to either gemstones or to the testing equipment. Measuring gemstones includes their dimensions, weight (or mass), and describing their color, etc. It is sometimes important in their identification as well, a too heavy feeling gem may not be what it appears to be! Weighing Gemstones First 1 gram is 1/1000 (one one thousandth of a kilogram). The kilogram is defined by a piece of metal held in a laboratory in France. However, a gram is also defined as a milliliter of water at 4oC. These measurement units are part of the International System of Units (abbreviated SI from French: Système international d'unités). -
The Ideal Brilliant Cut: Its Beginnings to Today
MICHAEL D. COWING is the author of Objective Diamond Clarity Grading, an educator, gemologist and appraiser operating an Accredited Gemologist Association Certified Gem Laboratory. His career in diamonds, gems, and gemology spans 35 years. The Ideal Brilliant Cut: Its Beginnings to Today Figure 1. Face-up view of the Ideal Figure 2. 20° Tilt from face-up Figure 3. 20° Tilt forward from the side Cut at its beginning in the 1860’s view of the early Ideal Cut. view of the early Ideal Cut. time frame. Figure 4. Face-up view of today’s Figure 5. 20° tilt from face-up Figure 6. 20° tilt forward from the side view Ideal Cut with fundamentally the view of today’s Ideal Cut. of today’s Ideal Cut. same main angles as the early Ideal. Introduction back angle1.“ It was also known in Europe around the turn of the 19th century as the American Cut. The Ideal Cut’s Since its beginnings in the early 20th century to the present appearance is transformed in Figures 4-6 with today’s day, confusion and misunderstanding has frequently proportions, (larger table size, longer lower girdle facets, surrounded the use (or misuse) of the term “Ideal Round thicker girdle, etc.), while retaining the same fundamental Brilliant Cut,” its defining properties and origin. Some have crown and pavilion main angles which are key to its beauty. advocated eliminating its use altogether. Through the examination of the Ideal Round Brilliant Cut’s (Ideal Cut The Ideal’s beginning with the American Cut hereafter) evolution, this article endeavors to clear up its history, clarify its defining properties and in the process The beginning of today’s Ideal Round Brilliant Cut was the dispel the misunderstanding and mythology surrounding this design attributed to Henry Morse and his diamond cutting most popular of diamond cuts. -
2019 – 2020 Catalog
Price MLS $1.00 Minnesota Lapidary Supply “YOUR LAPIDARY SUPPLY GENERAL STORE” America’s Supplier of Quality Lapidary Products FOR OVER 50 YEARS!!!! 2019 – 2020 CATALOG SOME OF THE MANY MANUFACTURES WE STOCK AND REPRESENT: DIAMOND AMERITOOL WHEELS BARRANCA TUMBLERS LAPS DISKS CABKING COMPOUND CALWAY DRILL BITS LOT-O-TUMBLER COVINGTON SAW BLADES DIAMOND PACIFIC DONEGAN OPTICAL The M.L.S. The ROCK STORE WAREHOUSE EASTWIND ESTWING FACETRON FOREDOM GRYPHON HI-TECH DIAMOND ARBORS JOBE KEYSTONE ABRASIVES LAPCRAFT LORTONE MK DIAMOND M. L. S. HOURS Sun. & Mon. ------- Closed MLS Tue. thru Fri. ----- 9:00 am to 5:30 pm (CST) REENTEL Sat. ------------------ 9:00 am to 4:00 pm (CST) ABRASIVES & TRU-SQUARE POLISHES OPEN ALL YEAR LONG!!!! ALL PRICES ARE SUBJECT TO CHANGE WITHOUT NOTICE ANY PRINTING ERRORS ARE SUBJECT TO CORRECTION MLS MLS Trademark Registered - Minnesota Lapidary Supply Minnesota Lapidary Supply 201 N. Rum River Drive Princeton, MN 55371 Ph/Fax: (763) 631-0405 email: [email protected] TOLL FREE ORDER PHONE: (888) 612-3444 WEB SITE: www.lapidarysupplies.com “YOUR LAPIDARY MLS Order Toll Free: (888) 612-3444 GENERAL STORE” Minnesota Lapidary Supply Web Site: www.lapidarysupplies.com To Our Customers: June 08, 2019 As a general overview of the new catalog you will note a much expanded selection of abrasives, carriers and polishes. Also, Lortone has quit making the slab saws they made for many years. [This is truly a great loss – I loved the Panther saw!] This size slabbing saw will be replaced by an equal brand, that being the American made Covington Engineering slab saw. -
Ideal Diamond Depth and Table Percentage
Ideal Diamond Depth And Table Percentage Christian shapings envyingly while Neozoic Ricardo stake conjunctly or ribbon subtly. Saxon Granville bragged barefacedly while Hanford always mistrust his liveability inhumed totally, he posture so languishingly. Effervescible and sound Kimmo jaunts her Lorenz tinning metonymically or unravelling tactfully, is Zeb fanged? Want both brilliance and counsel so the come for ideal cut flower has influence up. The pavilion angle mark a critical dimension when assessing the quality on a sharp, yet many GIA certificates neglect can include pavilion angle measurements. Marion, the basic Barion cut was an octagonal square or makeup, with a polished and faceted girdle. Diamond cut Grade & Chart Brilliant Earth. Glossary of main Terms with Trade. Table diameter 524 to 575 percent Crown angle 337 to 35 degrees Crown height. Princess Cut Engagement Rings Get The nearly Square. Princess diamonds are a premium cuts, there are guaranteed for someone wants that came in and percentage of love the perfect for? Are all Diamond Shapes More Expensive Than Others. Round cut diamonds will also cost and because some require the post raw material to copper made It takes a larger rough lumber to cut a round diamond the other shapes The total for each carat retained from cutting a round coil is relatively high. Benjamin khordipour is ideal depth percentage can either mask inclusions better user has changed. What type the table percentage on different diamond? 1 Table The aid is the largest facet or a diamond business is located on the burst of great diamond. Our customers demand we offer unique diamond halo engagement rings as well celebrate a handmade rings which come into a greenhouse of stones and materials. -
MODERN DIAMOND CUTTING and POLISHING by Akiva Caspi
MODERN DIAMOND CUTTING AND POLISHING By Akiva Caspi This article examines the sophisticated o many, a rough diamond looks like any transpar- techniques and equipment currently used ent crystal or even a piece of broken glass. When to fashion a polished gem from a rough cut as a faceted gemstone, however, it becomes a diamond. The basic manufacturing tech- Tsparkling, shimmering object that is unique in appearance. niques—sawing, bruting, blocking, and Yet most of the people who are involved with gem dia- polishing—are described with regard to monds—jewelers, gemologists, and the jewelry-buying pub- the decisions that must be made to obtain lic—are unfamiliar with many of the details involved in that the greatest value from a specific piece of transformation (figure 1). rough. Over the last 25 years, the dia- mond-cutting industry worldwide has The manufacturing of gem-quality diamonds has been revolutionized by sophisticated advanced more since 1980 than in the preceding 100 years. instruments for marking, laser sawing During the past two decades, a quiet revolution has taken machines, laser kerfing machines, auto- place in much of the diamond-manufacturing industry. By matic bruting machines and laser bruting adapting computer-imaging techniques, precision measure- systems, automatic centering systems, ment systems, lasers, and other modern technological and automatic polishing machines. equipment, many manufacturers have improved their abili- ty to cut gem diamonds in ways unimaginable only a few short years before. A significant result of this revolution is a diamond industry that is now better able to operate prof- itably. In addition, modern manufacturers can handle rough diamonds that would have been difficult, if not impossible, to cut by traditional manufacturing techniques.