Item description: Diffraction Spectroscope for Testing COLORED Gemstones An easy to use, the clear sharp focus of the spectrum will quickly enable you to analyze the readings for your gemstones.Light enters through a narrow slit and is then diffracted by a thin film of diffraction grating material. This produces a linear spectrum image with a generally larger view of the red part than a prism spectroscope.This spectroscope does not have a built-in scale. The Spectroscope measures light absorption in a gemstone. Simply put, if a certain light spectrum is missing, you then have a clue as to which sort of stone you may have. This instrument is handy for all sorts of stones, real or synthetic! Warranty: Every unit comes with a 1 Year Warranty against defects! International Shipping: Weight: 1lb Country US Postal Air Mail* Other Shippers (inquire) Canada $12.00 USD The rest of the world, except Italy $15.00 USD Italy $15.00 USD, Major delays FedEx: $80.00 * = There is no Insurance or Tracking Numbers with this service, although it is very reliable. For shipping with Insurance and Tracking Numbers, orders will need to be shipped via USPS Express Mail, FedEx or UPS. E-mail for a quote for those options. Lost packages are lost and not our responsibility, however, USPS has yet to lose a package yet. Import duties are lower with USPS too (if any at ALL)! CAN'T FIND WHAT YOU NEED? E-MAIL US! CHECK OUT OUR STORE AT WWW.NISUPPLY.COM! BUY WITH CONFIDENCE AND THE PEACE OF MIND! THIS IS OUR BUSINESS, NOT A HOBBY! WE'LL BE HERE IF YOU EVER NEED US! Other types of Gemstone ID equipment are available through our Store! ---- Click here RGM-700: 1.30 to 1.81Refractive Index Gemstone Refractometer with Internal Light!. Perfect for Beginners or Professionals! National Industrial Supply 30777 Rancho California #891420 Temecula, CA 92589, USA Sales: 951.308.9269 Fax: 310.833.7306 We prefer Paypal!