TUCSON 2004

COLORED STONES AND ORGANIC MATERIALS

• Yellow cat’s-eye beryl from Brazil.
• Update on demantoid and cat’s-eye demantoid from Iran.
• Blue omphacite from Guatemala.
• Black cultured pearls from Japan.
• New ruby production from Malawi.
• Pink to pink-orange spinel from Tanzania.
• Large tsavorite and green grossular from Tanzania.

SYNTHETICS AND SIMULANTS

• Color-change glass, imitating alexandrite.

TREATMENTS

• Commercial production of HPHT-treated diamonds showing a color shift

CONFERENCE REPORT

• Accredited Gemologists Association conference.

GNI REGULAR FEATURES

DIAMONDS

• Update on proprietary diamond cuts.
• A diamond exhibiting a spectacular phantom.

COLORED STONES AND ORGANIC MATERIALS

• Black horn coral coated with artificial resin.
• Petroleum inclusions in quartz from Pakistan: A photo-essay.

INSTRUMENTS AND TECHNIQUES

• New Swarovski triplet loupe.

CONFERENCE REPORTS

• Diamond presentations at the Australian Diamond Conference.
• “Science of Gem Materials” session at the MRS meeting.
• Sinkankas tourmaline symposium.

ANNOUNCEMENTS

• Dr. Henry A. Hänni receives AGA Bonanno Award.
• Dr. George R. Rossman receives Feynman Prize.
• Upcoming conferences and exhibits