Lab Notes Gems & Gemology, Summer 1986, Volume 22, No. 2

Summer 1986 G&G Lab Notes

Cobalt-Bearing Devitrified Glass
Glass with an Unusual Inclusion
Dyed and Sealed Lapis Lazuli
Assembled Opal Beads
Green Opal from Brazil
Cultured Pearls
Cat's-Eye Rutile
CobaIt-Blue Spinel
Turquoise with Simulated Matrix

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