{"product_id":"grandidierit-0-91ct-rechteck-madagaskar","title":"Grandidierite 0.91 ct – Rectangle Cut, Madagascar","description":"\u003cp\u003eThis grandidierite weighs \u003cstrong\u003e0.91 ct\u003c\/strong\u003e and comes from Madagascar. It is worked in a \u003cstrong\u003erectangular cut\u003c\/strong\u003e and is \u003cstrong\u003euntreated\u003c\/strong\u003e — at almost one carat it is among the larger stones this material yields at all.\u003c\/p\u003e\n\u003cp\u003eThe rectangular cut makes use of the length of the rough and loses little substance in doing so. With a material that rarely yields large clear pieces, every tenth of a carat that does not end up in the grinding slurry counts.\u003c\/p\u003e\n\u003ch3\u003eAbout grandidierite\u003c\/h3\u003e\n\u003cp\u003eGrandidierite was discovered in Madagascar in 1902 by Alfred Lacroix and named after the French explorer Alfred Grandidier. For decades the mineral was known almost exclusively in a cloudy, opaque form — facetable, clear material remained the exception and still comes almost entirely from southern Madagascar.\u003c\/p\u003e\n\u003cp\u003eIts colour lies between blue-green and green-blue and comes from iron in the crystal lattice. The pronounced trichroism is striking: depending on the viewing direction, the same stone appears colourless, blue-green or dark green. With a Mohs hardness of 7 to 7.5, grandidierite is considerably more robust than many other collector stones; a distinct cleavage nonetheless demands care when cutting and setting.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eStone type: grandidierite\u003c\/li\u003e\n\u003cli\u003eWeight: 0.91 ct\u003c\/li\u003e\n\u003cli\u003eOrigin: Madagascar\u003c\/li\u003e\n\u003cli\u003eCut shape: rectangle\u003c\/li\u003e\n\u003cli\u003eTreatment: none, untreated\u003c\/li\u003e\n\u003cli\u003eCutting: our own workshop\u003c\/li\u003e\n\u003cli\u003eLocation: Austria\u003c\/li\u003e\n\u003cli\u003eAvailability: unique piece, one only\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFurther single pieces from the same material can be found under \u003ca href=\"\/en\/collections\/grandidierit\"\u003eGrandidierite\u003c\/a\u003e, rare species beyond it under \u003ca href=\"\/en\/collections\/weitere-edelsteine\"\u003eMore gemstones\u003c\/a\u003e. Would you like your own rough stone cut, or an existing stone reworked? We take that on in our workshop — more under \u003ca href=\"\/en\/pages\/gemstone-cutting-services\"\u003eServices\u003c\/a\u003e.\u003c\/p\u003e","brand":"ManhArt Gemstones","offers":[{"title":"Default Title","offer_id":59073207533893,"sku":"GRA-MAD-091-REC","price":299.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0926\/3503\/8021\/files\/Grandidierite-Madagascar-0.91ct-Untreated.jpg?v=1791570297","url":"https:\/\/manhart-gemstones.com\/en\/products\/grandidierite-0-91ct-rectangle-madagascar","provider":"Manhart Gemstones","version":"1.0","type":"link"}