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Jade Matrix - a rock containing a mixture of tremolite and albite feldspar. Also called snowflake jade.
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Jet - variety of fossilized wood, similar to lignite or brown coal, and halfway in formation between peat and bituminous coal. Also called gaget.
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Jet Stone - black tourmaline, also called schorl.
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Jewel - an unmounted gemstone or an ornament worn for personal adornment which contains gemstones.
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Jump Ring - a small round wire ring made of gold, platinum or silver used to connect two separate items together such as attaching a clasp to a chain. Jump rings come in many different sizes and thicknesses and are available in yellow, white, and rose gold, platinum and silver.