Organic Gemstone (Not A Mineral)

Lapis Lazuli

Lapis Lazuli (Rock containing Lazurite, Na8[AlSi O4]6[S,Cl,SO4,OH]2)

Quartzite

Quartzite (SiO2)

Jasper

Jasper (Silicate mineral, SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Beryl (Emerald Variety)

Beryllium Aluminum Silicate (Be3Al2(SiO3)6)

Quartz Crystal (specifically a small Clear Quartz point)

Silicon Dioxide (SiO2)

Amazonite (likely mixed with other feldspars/minerals)

Amazonite is a variety of Microcline, which is a tectosilicate mineral, formula KAISi3O8. The mixed beads could include other feldspars or quartz.

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Rhodonite in Quartz Matrix

Rhodonite (Manganese Silicate - (Mn,Fe,Mg,Ca)SiO3)

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Clear Quartz

Silicon Dioxide (SiO2)

Obsidian (specifically Mahogany Obsidian)

Volcanic glass (high silica content, SiO2)

Obsidian

Volcanic Glass (70-75% SiO2)

Red Jasper (Chert)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Sugilite

Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)

Citrine

Quartz (SiO₂)

Mixed Mineral Specimens

Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)

Quartz

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Epidosite (Epidote-rich rock)

Epidotalite (primarily Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH))

Jasper (specifically Picture Jasper or Landscape Jasper)

Silicon Dioxide (SiO2) - Opaque variety of Chalcedony/Quartz

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon dioxide (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Basalt with Garnet inclusions

Basalt containing Nesosilicate (Garnet Group, likely Almandine Fe3Al2Si3O12)

Diamond

Diamond (pure Carbon, C)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Pink Tourmaline (Rubellite)

Elbaite - Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3OH

Corundum (Sapphire in Host Rock)

Corundum (Aluminum Oxide, Al2O3)

Smoky Quartz

Silicon Dioxide (SiO2)

Diamond (as set in a metal alloy ring)

Diamond (Pure Carbon, C)

Banded Agate (Onyx variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Ruby

Corundum (Al2O3 with Chromium trace impurities)

Diamond

Carbon (C)

Jasper

Jasper (Silicate - SiO2)

Blue Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Red Jasper (Opaque Chalcedony)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock with secondary mineral fillings)

Quartz Mineral

Silicon Dioxide (SiO2)

Mahogany Obsidian

Volcanic glass containing Magnetite/Hematite

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Ruby and Diamond in Gold Setting

Corundum (Al2O3) and Diamond (C)