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. High Quality Portable Calcite Dichroscope, GEM tools Don't let the low price fool you, this is the same dichroscope other online sellers and jewel stores sell for $40-$100 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. This is the same dichroscope that JTV.COM sells for $99 Larger quantity welcome, Our price is factory direct, please feel free to contact us for a quote. We ship from USA in 1 business day. For payment received before 3pm PTD(pasific Daylight Time), we will ship in the same day. Dichroscope show whether or not a stone is dichroic (reflects 2 colors). This can be helpful in differentiating stones of the same color from one another. Dichroscopes can be useful with identifying gemstones that are still in the rough and when stones are set and difficult to get to with other instruments. Light entering the dichroscope is broken into two polarized rays that have vibrational directions at right angles to each other. The two images in the dichroscope represent the polarized light and the pleochroic colors signifies doubly refractive stones except if the stone is viewed thru the optic axis. Single color in the dichroscope represents singly refractive stones. The advantage of the dichroscope is that the two pleochroic colors that may be characteristic of a given direction in a doubly-refractive gem are seen side by side. If no dichroism is identified in the first assessment, the stone can be turned and viewed in other directions. Trichroic gems can also be distinguish and will reveal three colors if the stone is viewed in three directions perpendicular to each other. Type : calcite Diameter : 15mm Length : 60mm Body : Metal Made in one part, same type like GIA's dichroscope Operating Information : Eye viewer: Hold the upper portion of the dichroscope to your eye. Gem View: Hand hold and place the gemstone flush to the opening. The hexagonal shape at the end makes it easier to turn the dichroscope during identification. Gem Prong: Gem Place Gemstone in the prong holder into the open space as shown above. Preparation Complete Identify Pleochroism. With gemstone visible through the Gem View opening slowly turn the dichroscope exactly 1 fullrotation. Pay close attention to any color differentiation between the two small squares visible inside the dichroscope during the rotation. That number of different colors determines the refractivity and pleochroic properties of the stone. Repeat the rotation a few times to double check the count. If you do not see color changes be sure to turn the gemstone to several other angles and repeat the process above. Sometimes the pleochroism only shows on a particular axis of the gem. Every Dichroscope come with a Leather Soft Case and 2 years warranty! LARGE QUANTITY BUSINESS WELCOME, PLEASE MAIL TO US! m stones Basic body color Optical type Typical pleochroism Colored tourmaline Red, greed, blue, yellow Uniaxial,dichroic Usually a paler/deeper color contrast and green/brown or green/black Chrysoberyl,deep yellow or brown yellow Biaxial,dichroic or trichroic Colorless/pale yellow/yellow Topaz,deep yellow Deep yellow Biaxial,dichroic or trichroic Yellow/pale yellow/pinkish-yellow Chrysoberyl-alexandrite Green in daylight,red in tungsten light Biaxial,trichroic Green/purplish-red/yellowish in day light,green/orange/red in tungsten light Beryl-emerald green Uniaxial,dichroic Bluish-green/yellowish-green Corundum-ruby red Uniaxial,dichroic Red/orange red Beryl-aquamarine blue Uniaxial,dichroic Colorless or pale blue/sky blue or deep blue Corundum-sapphire blue Uniaxial,dichroic Blue/greenish-blue Synthetic corundum colored by vanadium Grayish-blue to bluish-purple in daylight,reddish-purple In tungsten light Uniaxial,dichroic Brownish-green or yellowish/purplish lolite blue Biaxial,dichroic or trichroic Violet blue/paler blue/pale yellow or blue/pale yellow to near colorless,or two blues (description exceeds maximum possible length)