Pearls (likely freshwater cultured pearls)
Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin
gemstone
Category
Man Made Object (Ring)
Browse man made object (ring) specimens identified by the Rock Identifier community.
Learn about Man Made Object (Ring) in the encyclopedia
View all →
Crinoid Stem Fossil
Crinoidea (Class) - Calcium Carbonate (CaCO3)
fossil
Crinoid Marble
Crinoidal Limestone/Marble
fossil
Pumice
Pumice (Amorphous volcanic glass)
igneous
Slate
Slate (foliated metamorphic rock)
metamorphic
Howlite
Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)
mineral
Black Onyx
Chalcedony (SiO2)
gemstone
Diamond (set in jewelry)
Diamond (Carbon, C)
mineral
Garnet
Garnet Group (Silicate mineral); general formula X3Y2(SiO4)3
mineral
Blue Agate Ring
Silicon Dioxide (Chalcedony variety Agate), SiO2
gemstone
Carnelian (Chalcedony variety)
SiO2 (Silicon Dioxide)
Mineral
Chalcedony (Pancawarna / Bacan / Red Chalcedony Agate Ring)
Silicon dioxide (SiO2)
gemstone
Citrine
Quartz (SiO₂)
mineral
Slate
Slate (Metamorphic silicate rock)
metamorphic
Diamond
C (Native Carbon)
gemstone
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Slate
Foliated low-grade metamorphic rock
metamorphic
Pumice
Pumicite (Amorphous Volcanic Glass)
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Banded agate pendant (likely carnelian or brown-and-white chalcedony agate)
Agate, a banded variety of chalcedony; microcrystalline quartz, SiO₂, with iron-oxide coloration
gemstone
Petrified Wood
Silicified Wood / Xylopal
fossil
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Ruby in Fuchsite
Corundum (Al2O3) in Chrome-Mica (KAl2(AlSi3O10)(OH)2)
metamorphic
Dendritic Agate (Montana Moss Agate)
Silicon Dioxide (SiO2) - Chalcedony with Manganese/Iron inclusions
mineral
Blue sapphire ring
Corundum, aluminum oxide (Al₂O₃), blue variety colored mainly by iron and titanium
gemstone
Orbicular Gabbro
Orbicular Gabbro
igneous
Petrified Wood
Silicified Wood (mainly Quartz / SiO2)
fossil
Jade (Jadeite or Nephrite)
Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Pumice
Pumicite (Amorphous Volcanic Glass)
Igneous
Gold Ore (in Quartz/Pyrite)
Native Gold (Au) with Quartz (SiO2) and Pyrite (FeS2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
sedimentary (man-made composite)
Diamond
Carbon (C)
gemstone
Brecciated Agate / Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Howlite
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Amethyst
Quartz (SiO2) with trace iron impurities
Mineral
Green Chalcedony (likely Chrysoprase or dyed Green Agate)
Silicon Dioxide (SiO2) with nickel impurities or chromium/dye
mineral
Chert Nodule in Limestone (Flint in Chalk)
SiO2 (Microcrystalline Quartz) in CaCO3 (Calcite)
sedimentary
Blue opalite (often sold as synthetic opal)
Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)
gemstone