cloisonné french pronunciation: is an ancient technique for decorating metalwork objects. in recent centuries, vitreous enamel has been used, and inlays of cut gemstones, glass and other materials were also used during older periods.the resulting objects can also be called cloisonné.the decoration is formed by first adding compartments cloisons in french to the metal object by soldering .
the name grossular is derived from the botanical name for the gooseberry, grossularia, in reference to the green garnet of this composition that is found in siberia. other shades include cinnamon brown cinnamon stone variety , red, and yellow. grossular is a gemstone. in geological literature, grossular has often been called grossularite.
spessartine, sometimes mistakenly referred to as spessartite, is a nesosilicate, manganese aluminium garnet species, mn 2 3 al 2 sio 4 3. the mineral spessartine should not be confused with a type of igneous rock a lamprophyre called spessartite.. spessartine's name is a derivative of spessart in bavaria, germany, the type locality of the mineral. it occurs most often in granite pegmatite .
a large variety of minerals and gemstones are found in these mountains: emerald and tourmaline are found in the north, and garnet and quartz are found in the bajaur and south waziristan agencies. department of minerals is the government department working for the exploration and development of the mining industry in the region. according to .
spessartine or spessartite is manganese aluminium garnet, mn 3 al 2 sio 4 3. its name is derived from spessart in bavaria. it occurs most often in granite pegmatite and allied rock types and in certain low grade metamorphic phyllites. spessartine of an orange -yellow is found in madagascar.
rhodolite is a varietal name for rose-pink to red mineral pyrope, a species in the garnet group. it was first described from cowee valley, macon county, north carolina. the name is derived from the greek 'rhodon' for 'rose-like', in common with other pink mineral types e.g. rhodochrosite, rhodonite .
an asterism is an optical phenomenon displayed by some rubies, sapphires, and other gems e.g. garnet, diopside, spinel of an enhanced reflective area in the shape of a 'star' on the surface of a cabochon cut from the stone. star sapphires and rubies display the property from titanium dioxide impurities present in them.
it yielded an oval mixed-cut 325 carat 65 g stone, one of the largest, if not the largest, faceted tsavorites in the world. a crystal that yielded a 120.68-carat 24.136 g oval mixed-cut gem was also uncovered in early 2006. tsavorite formed in a neoproterozoic metamorphic event which involved extensive folding and refolding of rock.
almandine, also known as almandite, is a species of mineral belonging to the garnet group. the name is a corruption of alabandicus, which is the name applied by pliny the elder to a stone found or worked at alabanda, a town in caria in asia minor. almandine is an iron alumina garnet, of deep red color, inclining to purple. it is frequently cut with a convex face, or en cabochon, and is then known as carbuncle. viewed through the spectroscope in a strong light, it generally shows three characteri
spessartine of an orange -yellow has been called mandarin garnet and is found in madagascar. violet-red spessartines are found in rhyolites in colorado and maine. in madagascar, spessartines are exploited either in their bedrock or in alluvium. the orange garnets result from sodium-rich pegmatites.
a carbuncle /ˈkɑːrbʌŋkəl/ is any red gemstone, most often a red garnet. a carbuncle can also be a stone with magical properties, usually capable of providing its own illumination to an otherwise dark interior. this is encountered in a number of medieval texts. in the french romance of c.
this article needs additional citations for verification. please help improve this article by adding citations to reliable sources. unsourced material may be challenged and removed. this is a list of gemstones, organized by species and type. there are over 300 types of minerals that have been used as gemstones.
a gemstone also called a gem, fine gem, jewel, precious stone, or semi-precious stone is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments. however, certain rocks such as lapis lazuli and opal and occasionally organic materials that are not minerals.
folktales about luminous gemstones are an almost worldwide motif in mythology and history among asian, european, african, and american cultures. some stories about light-emitting gems may have been based on luminescent and phosphorescent minerals such as diamonds.
cloisonné french pronunciation: klwazɔne is an ancient technique for decorating metalwork objects. in recent centuries, vitreous enamel has been used, and inlays of cut gemstones, glass and other materials were also used during older periods. the resulting objects can also be called cloisonné.
carnelian also spelled cornelian is a brownish-red mineral commonly used as a semi-precious gemstone.similar to carnelian is sard, which is generally harder and darker the difference is not rigidly defined, and the two names are often used interchangeably .both carnelian and sard are varieties of the silica mineral chalcedony colored by impurities of iron oxide.
the art of cutting a gem is an exacting procedure performed on a faceting machine.the ideal product of facet cutting is a gemstone that displays a pleasing balance of internal reflections of light known as brilliance, strong and colorful dispersion which is commonly referred to as 'fire', and brightly colored flashes of reflected light known as scintillation.
cut: cubic zirconia gemstones may be cut differently from diamonds. the facet edges can be rounded or 'smooth'. color: only the rarest of diamonds are truly colorless, most having a tinge of yellow or brown to some extent. a cubic zirconia is often entirely colorless: equivalent to a perfect 'd' on diamond's color grading scale. other desirable .