Answer: OPAL

AnswerCrossword Clue
OPALPlay-of-color gem
OPALBrilliant stone (4)
OPALAutumnal stone
OPALIridescent stone
OPALFire ..
OPALOnyx, in part
OPALShade of gray
OPALBirthstone of some Librans
OPALGeyserite, for one
OPALOff-white shade
OPALGem found on Mars
OPALOctober gem
OPALHalloween birthstone
OPALTranslucent gem
OPALIridescent form of silica
OPAL1995 hurricane that damaged the Florida Panhandle
OPALCoober Pedy mine find
OPALPrecious Australian export
OPAL... Fruits (Starburst candy, originally)
OPALHeat-sensitive gemstone
opalprecious iridescent stone
OPALFiery gem
OPALFall birthstone
OPALOctober birthstone
OPALOctober stone
OPALStone for some Scorpios
OPALGirasol
OPALRing rock
OPALTranslucent birthstone
OPALAutumnal birthstone
OPALBirthstone
OPALMilky stone
OPALFiery gemstone
OPALFiery stone
OPALFire or black gem
OPALMilky gemstone
OPALOctober's jewel
OPALSmoky gem
OPALAustralia's national gemstone
OPALMilky gem