Gem (44 Down), coral (26 Across), image (7 Down), prism (1 Across), ideal (2 Down), index (47 Across)
The term gem is applied to diamond and many inorganic ores, such as olivine (see later), and to some organic substances produced by living organisms, such as amber (hardened tree resin), coral and jet (a shiny, i.e. lustrous, fossilised wood).
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