Like any typical critical angle refractometer, it measures the refractive index of faceted stones, transparent to nearly opaque, whether loose or mounted (in many cases), up to an R.I. value of 1.81. This model is solidly built and of the highest quality. It is equipped with a built-in monochromatic filter, so that no special monochromatic illuminator is required. The instrument's eyepiece contains a polarizing filter for precise measurement of birefringence and is telescopically adjustable for the clearest possible image. The refractometer kit also includes a bottle of refractive index liquid and a calibration block.<\/p>\n
If the gemstone is birefringent, which is best seen by rotating the polarizing filter while looking at the scale, two shadow lines will be seen, the numerical difference of which corresponds to the birefringence of the gemstone.<\/p>","protected":false},"excerpt":{"rendered":"
A gem refractometer is an essential tool for gemstone identification, used in gemological laboratories and by jewelers. With a gemstone refractometer, the refractive index of gemstones can be precisely measured, providing valuable information for their identification. The working principle of a gem refractometer is based on light entering through a window on the back and being projected onto the stone. A hinged lid allows a gemstone to be placed on the flat side of a half cylinder made of high-purity special glass. The front ocular magnifies the scale. The lens is equipped with a rotatable polarizing filter. Both the filter and the lens are removable.<\/p>\n
The shadow of the gem is cast on the scale and the RI is read where the shadow line runs.<\/p>","protected":false},"featured_media":4488,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"product_brand":[677],"product_cat":[219,207,204,217],"product_tag":[519,663,603,602,501,502,662,242],"class_list":["post-4915","product","type-product","status-publish","has-post-thumbnail","product_brand-arcarda","product_cat-analoge-refraktometer","product_cat-brechzahl-nd","product_cat-gemmologie-edelsteine","product_cat-produkte","product_tag-arg","product_tag-arg-111","product_tag-arg111","product_tag-edelstein","product_tag-gem","product_tag-gemmologie","product_tag-gemref","product_tag-refraktometer","first","instock","purchasable","product-type-simple"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/arcarda.com\/en\/wp-json\/wp\/v2\/product\/4915","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/arcarda.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/arcarda.com\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/arcarda.com\/en\/wp-json\/wp\/v2\/comments?post=4915"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/arcarda.com\/en\/wp-json\/wp\/v2\/media\/4488"}],"wp:attachment":[{"href":"https:\/\/arcarda.com\/en\/wp-json\/wp\/v2\/media?parent=4915"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/arcarda.com\/en\/wp-json\/wp\/v2\/product_brand?post=4915"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/arcarda.com\/en\/wp-json\/wp\/v2\/product_cat?post=4915"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/arcarda.com\/en\/wp-json\/wp\/v2\/product_tag?post=4915"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}