Bicolor Rough Diamond Crystals
Two Australian rough diamonds demonstrate both pink and colorless sections in the same crystal.
Cat’s-Eye Opal
A rare chatoyant effect is produced within play-of-color patches in a natural opal.
Rare Faceted Hexagonite
The Carlsbad laboratory recently examined an unusually large faceted hexagonite with iridescent cleavage cracks and needle-like structures.
Asterism in Natural Diamond Cabochons
Two cabochons displaying white four-rayed “stars” are fashioned from one large natural diamond crystal.
Lead Glass–Filled Laboratory-Grown Ruby
Natural Fossil Pearls and Shell Blister from the Coast of Florida
Fossilized specimens discovered near St. Petersburg, Florida, provide unique insights into ancient mollusks.
Green Opal Displaying Aventurescence
Pyrite inclusions in a green common opal produce a pleasing aventurescence.