Garnet, opal and topaz are considered to be gemstones because gemstones are known for their beauty, colour, lustre (shininess) and rarity. They are also known for the way light passes through them, and hardness. All three of those gemstones have aspects of these.
due to more hardness
Garnet (January) Amethyst (February) Aquamarine (March) Diamond (April) Emerald (May) Pearl (June) Ruby (July) Peridot (August) Sapphire (September) Opal (October) Topaz (November) Turquoise (December)
Valuable Gemstones are:Diamond, Ruby, Sapphire, Emerald and AlexandriteCommon Gemstones are:Aquamarine, Tourmaline, Beryl, Garnet, Onyx, Moonstone, Peridot, Spinel, Zircon, Carnelian, Turquoise, Topaz, Agate, Lapis Lazuli, Jade, Chrysoberyl, Tanzanite, Emery, Opal and Amethyst
Diamond is an allotropic form of carbon.Ruby and sapphire are aluminium oxide naturally doped with some metals (as traces).Emerald is Be3Al2(SiO3)6.Chrysoberyl is Be2Al2O4.Opal is hydrated SiO2.Peridot is MgSiO4.Topaz is Al2SiO4(F,OH)2Malachite is Cu2CO3(OH)2.Jades and garnets are complex silicates.
Spain is known for producing a variety of gemstones, including pyrite, turquoise, garnet, amethyst, and agate. The country also has deposits of quartz, fluorite, opal, and jade. These gemstones can be found in different regions of Spain, each with its unique geological characteristics.
due to more hardness
To learn the identity of the gemstones opal, diamond, garnet, and topaz you need to look at their color, transparency, specific gravity. You need to light the stone's surface and look through a loupe. You also need to determine the birefringence and refractive index.
Garnet (January) Amethyst (February) Aquamarine (March) Diamond (April) Emerald (May) Pearl (June) Ruby (July) Peridot (August) Sapphire (September) Opal (October) Topaz (November) Turquoise (December)
Valuable Gemstones are:Diamond, Ruby, Sapphire, Emerald and AlexandriteCommon Gemstones are:Aquamarine, Tourmaline, Beryl, Garnet, Onyx, Moonstone, Peridot, Spinel, Zircon, Carnelian, Turquoise, Topaz, Agate, Lapis Lazuli, Jade, Chrysoberyl, Tanzanite, Emery, Opal and Amethyst
Diamond is an allotropic form of carbon.Ruby and sapphire are aluminium oxide naturally doped with some metals (as traces).Emerald is Be3Al2(SiO3)6.Chrysoberyl is Be2Al2O4.Opal is hydrated SiO2.Peridot is MgSiO4.Topaz is Al2SiO4(F,OH)2Malachite is Cu2CO3(OH)2.Jades and garnets are complex silicates.
Spain is known for producing a variety of gemstones, including pyrite, turquoise, garnet, amethyst, and agate. The country also has deposits of quartz, fluorite, opal, and jade. These gemstones can be found in different regions of Spain, each with its unique geological characteristics.
Fire opal:)
Amorphous Opal Beryl Aquamarine Emerald Morganite Carbon Diamond Chrysoberyl Alexandrite Corundum Ruby Sapphire Garnet (Pyrope) Mandarin Garnet (Spessartite) Rhodolite (Pyrope-Almandine) Tsavorite (Grossular Garnet) Olivine Peridot Quartz Amethyst Ametrine Citrine Spinel Topaz Blue Topaz Imperial Topaz Tourmaline Paraíba (Cuprian Elbaite) Tourmaline Rubellite Zircon Zoisite Tanzanite
January: Garnet February: Amethyst march: Aquamarine April: Diamond May: Emerald June: Pearl July: Ruby August: peridot September: Sapphire October: Opal November: Topaz December Turquoise
The two classifications are based on value. Rare (or precious) gems are very valuable while common (or semi-precious) gemstones are not.Precious Gems:Diamond, Sapphire/Ruby, Emerald, Pearl, AlexandriteSemi-Precious Gems:Aquamarine, Tourmaline, Beryl, Garnet, Amber, Onyx, Moonstone, Peridot, Spinel, Zircon, Carnelian, Turquoise, Topaz, Agate, Lapis Lazuli, Jade, Chrysoberyl, Tanzanite, Emery, Opal and Amethyst
There different ones because an opal birthstone is for October a topaz is for November
opal