Gem News International Gems & Gemology, Spring 2025, Vol. 61, No. 1 Green Jadeite-Omphacite from Guatemala. Jennifer Stone-Sundberg, Aaron Palke, and Wim Vertriest ...

This specimen represents one of the largest cultured pearls tested by GIA from the Pinctada maxima mollusk.Pinctada maxima is the largest species in the Pinctada genus, typically producing pearls ...

At the AGTA show, the author spoke with Brent Smith, owner of Phoenix Gems (Holly, Michigan), who shared a few parcels of rough spinel of different colors recently mined in Malawi. According to Smith, ...

GIA CAMPUSES ARE WORLDWIDE. With schools in major gem and jewelry centers around the world, GIA campuses are exciting learning environments. From the bustle of Mumbai’s diamond trading center to the ...

Jewelry Report. Designed for clients who seek in-depth insights into every aspect of a jewelry item. Comprehensive analysis of the diamonds in an item, including number of stones, shape, estimated ...

While Federal financial aid is not available for Online Education students, GIA-administered scholarships and payment plans for selected online courses are. GIA scholarship application cycle is from ...

According to Hole et al. (1969), the earliest Persian turquoise artifacts were discovered in the Deh Luran Plain in western Iran. Radiocarbon dating suggests that turquoise beads found in burial sites ...

These diamonds are from the 2016 Argyle Pink Tender in New York City. Left to right: 0.64 ct Fancy Deep pink oval, 0.75 ct Fancy Intense purplish pink trilliant, 0.91 ct Fancy Vivid purplish pink oval ...

GEOLOGICAL SETTING. The island of Phu Quoc lies in the Gulf of Thailand, about 45 km off the southwestern coast of Vietnam. The island has an area of 574 km 2.The terrain consists mainly of low ...

Figure 3. Formation of the pink-brown eclogitic diamonds at Argyle—the world’s largest diamond deposit. After their formation, Argyle pink-brown diamonds resided in the high-temperature, ...

As shown in figure 2, diamonds have formed over a wide range of the earth’s geologic history. The oldest dated examples are diamonds with an age of 3.5–3.3 Ga (billion years) from the Diavik and Ekati ...

Laboratory-Grown Diamonds. Man-made diamonds suitable for industrial use were first produced in a laboratory in the 1950s. While gem-quality diamonds were produced in a laboratory for the first time ...