from an unused root (probably identical with that of H7617 through the idea of subdivision into flashes or streamers (compare H7632) meaning to flame; a gem (from its sparkle), probably the agate; agate.
Usages throughout the bible
Exodus 28:19
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And the third row a ligure, an agate, H7618 and an amethyst.
Exodus 39:12
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And the third row, a ligure, an agate, H7618 and an amethyst.