• <track id="rvdbi"></track>
  • <menuitem id="rvdbi"><strong id="rvdbi"><menu id="rvdbi"></menu></strong></menuitem>

    <bdo id="rvdbi"></bdo>
        <track id="rvdbi"><span id="rvdbi"></span></track>

        About

        International Gem Society

        Articles by


        International Gem Society

        Gemology Career Options

        Thinking of becoming a gemologist? Consider these gemology career options, compare their estimated salaries, and decide which one may be right…

        What is Gemstone Transparency?

        Gemstone transparency describes how much light passes through a gem and how it scatters. Learn what causes a gem to be opaque, translucent, or transparent.…

        Should I Buy a Diamond Online?

        Do you want to buy a diamond for an engagement ring? Don’t. Still want to buy a diamond? OK. Here are the pros and cons of buying a diamond online.

        Properties of Diamond Simulants

        Diamond simulants, like cubic zirconia and moissanite, often appear in jewelry. See how the properties of real diamonds compare with popular…

        A Brief History of Diamonds

        Learn how diamonds formed geologically and how they became the virtual standard for engagement ring stones in this brief history of diamonds.…

        What is Gemstone Birefringence?

        Gemstone birefringence is a measure of a gem’s double refraction. Learn how it’s used to identify gems and see the effects birefringent gems…

        What is a Crystal?

        Learn the scientific definition of crystal used by gemologists and answer some basic questions about what is and is not a crystal.

        What is Gemstone Pleochroism?

        Some gems show pleochroism, two or three different colors depending on the viewing angle. Learn why this occurs and how it helps gemologists identify…

        Bead and Necklace Size Charts

        Whether you’re a novice bead jewelry maker or just shopping for necklaces, these bead and necklace size charts and links to related articles…

        Standard Gem Sizes Chart

        Will your gem fit in a standard setting? Use this chart of standard gem sizes for popular cuts and also learn how to estimate gem weight based on size.…

        Peridot Buying Guide

        Our peridot buying guide can help you learn how these gems are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.…

        Sphalerite Buying Guide

        Our sphalerite buying guide can help you learn how these gems are graded, what to avoid, and how to identify a high quality stone or a bargain in the…

        Opal Polishing Survey Results

        Take a look at the IGS member survey results for opal polishing. You’ll find recommendations for polishes, laps, and techniques for handling these…

        What is my Birthstone?

        The idea of a single birthstone for each month is a modern idea with a long history, but today’s consumers can choose gems from traditional or modern…

        Gemology Book Reviews: Careers

        Artists, lapidaries, and gem merchants all have stories to tell. Three very different books with varied perspectives explore the lives of people…

        Jewelers’ Pricing Survey

        The International Gem Society (IGS) ran a jewelers’ pricing survey in 2002 and 2012. Over those ten years, we saw significant changes in the world’s…

        Jewelry Nomenclature: Gem Earrings

        Earrings are available in many styles. Learn to identify the most popular types of metal and gem earrings and the parts that comprise these jewelry…

        Jewelry Nomenclature: Gem Rings

        Though rings may come in many styles, gem cutters will regularly encounter a few common types of gem rings. Learn how to identify these popular designs.…

        Topaz Buying Guide

        Our topaz buying guide can help you learn how topazes are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.…

        Ruby Buying Guide

        Our ruby buying guide can help you learn how rubies are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.

        Can Diamonds Burn?

        Diamonds may form under intense heat and pressure, but under certain conditions, diamonds burn. ?Learn the science behind a diamond’s fiery…

        Gemstone Orientation For Beginners

        Choosing the best gemstone orientation for your rough takes skill and experience. Learn what factors you should take into account before cutting.…

        Is Uranium Glass Safe To Facet?

        Uranium glass, or Vaseline glass, is a prized collector’s item and is generally safe to handle. But is it safe to facet? Learn about the potential…

        Gold Refining Advice For Jewelers

        Before you turn the alloyed gold you got a great deal on into gold jewelry, carefully consider what gold refining system will work best for you.

        Faceting Tips For Exotic Gemstones

        Some gems are seldom faceted because they’re rarely found in nature or rarely used for jewelry. Learn a few tricks for faceting seven exotic gemstones.…

        What Is A Chameleon Diamond?

        A classic chameleon diamond can change color from green to yellow under certain conditions. Learn more about this process and other color change…

        Facet Designs For Beginners

        What are the best facet designs for novice gem cutters? Find recommendations for cutting styles, books, resources, and gemstone rough here.

        Why Choose a Barion Cut?

        Gem faceters must consider factors like brilliance, color, and faceting yield before choosing a cut style. Learn what a Barion cut can bring to…

        Sphalerite Appraisal

        Learn what factors most influence a sphalerite appraisal and what kind of jewelry will best showcase this beautiful gemstone.

        Opal Jewelry Tips

        Opal jewelry is lovely, but aren’t these gems prone to scratching and breaking? Learn the best ways to wear these colorful but delicate stones.…

        What Is A Reflectometer?

        What’s the difference between a reflectometer and a refractometer? If you’re interested in studying or buying gems, learn the facts here.…

        Make a Bracelet

        A step by step procedure on how to make a bracelet. Detailed information on tools and materials needed. Read and Understand instructions to complete…

        Spectroscope Instructions

        The spectroscope is one of gemology’s principal tools. Our basic spectroscope instructions will teach you how to operate and calibrate this…

        Tremolite

        Tremolite runs in a solid-state series with actinolite to ferroactinolite. (Ferroactinolite is not used as a gemstone.) Details and information…

        Vivianite

        Vivianite is fragile and soft that cut gems would be difficult to handle safely,let alone wear.The color is very rich, and a few stones have been…

        Spinel

        Spinel has played an important part in gem history. Prior to the last century, it was impossible to distinguish from ruby and sapphire once it was…

        Rhodonite

        Rhodonite is a popular and useful decorative material, ranging in color from pink to a fine rose-red.This article covers informative content…

        Gem Price Guide

        A guide for the price of various gemstones that is based on various sources for commonly traded goods. However, gems are sold outside this range…

        Interviews

        The transcription of the interview of International Gem Society IGS with C.D. Parsons of Santa Paula, Calif. and Gerald Wykoff GG, CSM.

        Gem Designs

        This is a Gem Design Index. A list of several gem designs with details and instructions. Gather more information on various designs that are available.…

        Diamonds

        Diamond are our most popular gem. ts history of use and great value extends thousands of years into the past. Find out more on the properties of a diamond.…

        Tucson 2002

        This year we asked our members for their impressions of the Tucson show. Here are their impressions. A little insight on the Tucson 2002 extravaganza.…

        The Wire Artist Jeweller

        This is a neat, simple, project that will teach you how to string beads with wire. You can take these skills and create bracelets, necklaces, earrings,…

        A Tribute to Bench Jewelers

        A Bench Jeweler are artisans who sit in the back room patiently working on and carving Jewelry with very little to no acknowledgement on their work…

        Birthstone Chart

        Birthstones listed by month. Also listed are both the Modern Birthstones and the Ancient Birthstones.

        LAP MATERIALS

        A tabel of Lap Materials, Compliments of The International Gem Society. These figures are approximate and are put together for your general reference.…

        Ring Size Comparison Chart

        Ring Size Comparison Chart compliments of the International Gem Society. A conversion table of Ring sizes. 7 different ring size equivalents…

        Gem Structure Chart

        A gem structure chart that shows various information on a specific structure and gems of example. Details include Refractive Indexes, Pleochroism…

        METAL/WAX FORMULAS

        Jewelers need to know how to determine how much gold is needed for a wax mold. Here are three methods for you.Information and tips on metal or wax formulas.…

        BOOK REVIEW, Gem Dealers Secrets

        A book review on “Gem Dealers Secrets”. It is always a treat to find a book that lives up to expectations and is entertaining to read. This is such a…

        国产人人看人人拍视频