Colored Stones Cut with High Precision

阅读更多

Rock Buttons from the United States

阅读更多

Exotic Stingray Skin Jewelry

The Ferraccia Jewelry Collection exhibited a huge variety of stingray leather goods at the AGTA show, including bracelets, necklaces, earrings, rings, belts, purses, and mobile phone cases.

阅读更多

Zoned Scapolite from India

阅读更多

Buff-Top Round Diamond

The New York lab recently examined several diamonds with an interesting variation on the cabochon.

阅读更多

Diamond with Extremely Strong 578.9 nm Emission Center

阅读更多

Orange Diamond with Unusual Color Origin

GIA recently examined a rare orange diamond that demonstrated the complexity of diamond color origin.

阅读更多

Yellow Synthetic Sapphire Colored by Trapped-Hole Mechanism

A combination of trace-element analysis and UV-visible spectroscopy clearly indicated that the yellow color originated from the much more effective chromophore known as “trapped holes,” associated with the trace amount of Mg and Cr in this stone.

阅读更多

Large Oolitic Opal Block

The natural-color oolitic opal is the largest of its type examined by GIA.

阅读更多

Natural Pipi Pearls from Tahiti

An overview of natural

阅读更多

A Remarkably Large Amblygonite-Montebrasite Carving

阅读更多

Irradiated and Annealed Blue Type Ia Diamond

Examination shows that a diamond was subjected to a multi-step process in order to introduce a blue color.

阅读更多

Color-Change Pink Pyrope Garnet Update

阅读更多

Greenland Ruby Update

阅读更多

Amber Filled with Epoxy Resin

Gulf countries experience an increase in epoxy resin filling in amber rosary beads.

阅读更多

Johnkoivulaite: A New Gem Mineral

A new mineral, johnkoivualite, named after prominent GIA gemologist and photomicrographer.

阅读更多

Emerald Update with Arthur Groom

Eternity Natural Emerald utilizes emerald sourced from Afghanistan to provide calibrated sets ranging from all quality levels and price points.

阅读更多

Imitation Opal with Interesting Play-of-Color Pattern

New imitation opal displays pronounced play-of-color phenomenon in a unique pattern covering large surface areas.

阅读更多

Faceted Chiolite

A very rare faceted “snow stone” was recently encountered in the Carlsbad laboratory.

阅读更多

Vlasovite

A rare faceted vlasovite is encountered for the first time at the Carlsbad laboratory.

阅读更多

上一页第 237 页,共 239 页下一页

您或许还会喜欢

YMAL GIA Ed
了解校园课程和在线教育
Learn About NextGem
GIA NextGem™ 钻石零售 培训
Explore GIA Laboratory Promotional Offers
探索 GIA 鉴定所的促销优惠
Shop the GIA Store
访问 GIA 商店