The buckle of Isis was an ancient Egyptian amulet representing the buckle of Isis and affording eternal protection to the wearer. It was traditionally made from carnelian, red jasper, red glass or another red substance (representing the blood of Isis), and sometimes of gold. Research Buckle Of Isis
Agate is a semi-precious stone siliceous semi-pellucid compound mineral, consisting of bands or layers of various colours blended together, the base generally being chalcedony, and this mixed with variable proportions of jasper, amethyst, quartz, opal, heliotrope, and carnelian. The varying manner in which these materials are arranged causes the agate when polished to assume some characteristic appearances, and thus certain varieties are distinguished, as the ribbon agate, the fortification agate, the zone agate, the star agate, the moss agate, the clouded agate, etc. In Scotland they are cut and polished under the name of Scottish pebbles. Research Agate
Chalcedony is a cryptocrystalline, translucent variant of quartz comprised of silica, having usually a whitish colour, and a lustre nearly like wax.
Chalcedony was named after Chalkedon, near Istanbul. It was traditionally used for decorative objects and amulets. It has a relative hardness of 7. When chalcedony is variegated with spots or figures, or arranged in differently coloured layers, it is called agate; and if by reason of the thickness, colour, and arrangement of the layers it is suitable for being carved into cameos, it is called onyx. Chrysoprase is green chalcedony; carnelian, a flesh red, and sard, a brownish red variety. Research Chalcedony
 
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