Plastic Amber Imitation in a Rosary
Examination reveals both amber and Bakelite plastic beads in a rosary submitted for identification.
“Punsiri”-type FTIR Spectral Features in Natural Yellow Sapphires
Testing of natural-colour yellow sapphires from Australia and Thailand with the FTIR features of “Punsiri” heat-treated material.
Purple Pyrope-Almandine Garnet From Mozambique
Analysis of attractive purple garnets from a new deposit in central Mozambique.
Musgravite from Myanmar
Two small, near-colourless stones reportedly from Myanmar (0.11 and 0.24 ct; figure 1) were recently loaned to GIA for examination for identification.
Blue cat's-eye apatite
Deep blue apatite with a cat’s-eye effect, however, is very rare.
Demantoid garnet fossil pseudomorphs
In these two extremely rare specimens, demantoid garnet has replaced coral and gastropod fossils.
Faceted wurtzite from Tanzania
The rarity and value of faceted wurtzites from Tanzania are sure to draw the attention of gem collectors.
Polymer-Impregnated Aventurine Quartz, a New Imitation of “Ice Jade”
A bangle, thought to be jadeite jade, is revealed by laboratory testing to be polymer-impregnated aventurine quartz.
Coated Fire Opal in the Chinese Market
An investigation of a coated fire opal recently found in the Chinese market.
Bright yellow diamonds from Sierra Leone
Examination of strongly yellow diamonds from the Zimmi area of Sierra Leone revealed graphitised feather inclusions.