Holiday Return/Exchange Policy: For customers who purchase between now to December 25th, we will automatically extend the return/exchange date to January 31st. No restocking fee, no question ask, hassle free return. Diffraction Calcite Spectroscope Gemological Gem Shipfrom USA Larger quantity welcome, our price is factory direct, please feel free to contact us for a quote. Handheld spectroscope allows you to read a gemstone's spectral signature. What is detects: absorption spectra. How to use: view the colour of a gemstone, either by shining a light (pen-torch) through the stone into the spectroscope if the stone is transparent, or by viewing its reflected light if the stone is opaque. What you see: a spectrum (rainbow) which might be interrupted with black or white lines, it is the pattern of these lines you must learn to recognize. For the gemmologist: best at detecting iron and chromium. For the non-gemmolgist: the 'diamond simulants' YAG and Cubic Zirconia give spectacular spectra and so too does some Zircon. Other gemstones are more difficult to detect. Exactly what i needed!------a feedback from a GIA student Features: Heavy-duty and lightweight with its aluminum construction Precise, Easy and very convenient to use Durable, built to last long A top quality instrument giving a brilliant spectrum. Specifications: Length: 55mm Diameter: 18mm Material: Calcite, Aluminum (Heavy Duty) Made in one part, same type like GIA's spectroscope Inside Instruction: Diffraction Type Accessory included: Leather Carry Pouch Warranty: 2 years warranty (24 months) Spectroscope Buying Guide In gemology, there are two different types of spectroscopes, each with its own characteristics. 1. Diffraction grating spectroscope The diffraction grating spectroscope is based on the principle of diffraction. 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. Inside the diffraction grating spectroscope 2. Prism Spectroscope The prism spectroscope is based on dispersion. The light enters through a narrow slit and is then dispersed through a series of prisms. These models are generally more expensive than their diffraction type cousins. Because prism spectroscopes are based on dispersion, the blue area of the spectrum is more spread out and the red parts are more condensed than the diffraction grating types. Inside the prism spectroscope In conclusion, prism type is better than diffraction type, because it has a larger and more clear image. We have both types of spectroscopes, please click the links below Diffraction Spectroscope (Small Size) Diffraction Spectroscope (Medium Size) Prism Spectroscope Why Choose USA Seller: No long wait for your order! No additional customs import tax or hangups! More Reliable customer Support! Easy Exchange or return. Top Quality. Payments are accepted through Paypal. We ship through USPS First Class Mail from Oregon, west part of the country should receive in 1-3 days,middle part and east part of the country should receive in 2-5 days! International: We charge the same shipping cost to all our customers worldwide(same shipping cost worldwide). Our default shipping is United State Postal Service First Class mail, it take 5-10 business days for delivery. we also offer faster shipping EMS which take 3-6 days. Handing time: 1 business day. For payment received before 14:00PDT, it will ship in the same day. We do Combined Shipment on any multiple purchases. We are pleased to grant a20% discount on the shipping cost of purchases more than item. Please feel free to contact us for discounted shipping costs when you buy multiple items from us. MyStoreMaps improve local and international sales. We promise our best quality and the lowest price for our customers, if the item is not as the description in the listing page, we will issue a exchange or full refund. if the item is the same as the description, we will charge a 15% restocking fee. We are a new seller , all our prices are really low compare to others, because we want to earn feedbacks. Please understand our feedback will be left once after we have received feedback from buyer. Our goal is to place a profit margin of $1 ~ $3 per item and sell in volume. As such, the more you save the more we make. While the others are selling 1 item, we are selling 10 ~ 20 items due to our price reduction. Please use the "Ask Seller A Question" button. Please allow up to 24 hours for a response. Usually the buyer will get response in 6 hours. Customer Satisfaction • Please contact us right away (via Messages) if you have any concerns, questions or issues about your purchase – and before you leave feedback. • If you give us the chance, we will make every effort to make it right for you! • We strive for five stars from you in feedback – and work hard to earn it. • Customer satisfaction is very important to us and our goal is to have every customer want to be a repeat customer. Track Page Views With Auctiva's FREE Counter