JULY BIRTHSTONE

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Ruby is the July birthstone – and it’s one of the most coveted of gems. The name is derived from the...

The State of the Colored Stone Market Circa 2020

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Few people have a better perspective on the colored stone market than Stuart Robertson, vice president of Gemworld International in Glenview, Ill., publisher of The...

Blue Inclusion in Rock Crystal Quartz

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Figure 1. This 118.16 ct polished modified cube of rock crystal quartz contains an interesting tuft of blue needles, which may...

Unknown Dendritic Inclusions in Sapphire

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Left: When the pinkish purple sapphire was viewed under darkfield illumination, the only inclusions visible underneath the table were zircon crystals...

MARCH BIRTHSTONE

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Aquamarine and bloodstone, March’s two birthstones, are very different when it comes to appearance, but they share a similar reputation for...

DECEMBER BIRTHSTONE

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TURQUOISE BIRTHSTONE MEANING & HISTORY Turquoise is a semi-translucent to opaque gem that ranges from blue to green...

The major source of Gem Quality Minerals – Pegmatites

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February 12th, 2020 - By Olena Rybnikova Pegmatites are the major source of gem-quality minerals throughout...

Trapiche-Type Emeralds from Pakistan

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Growth pattern observed in a trapiche-type emerald from Swat, Pakistan. The slice shows two colorless cores and two intermediate lighter green...

Tree in Rock Crystal Quartz

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Figure 1. This 80.60 ct rock crystal quartz cabochon contained an interesting tree-like metal sulfide inclusion. Photo by Robert Weldon.

Collectors guide to emeralds

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Renowned for their striking colour, emeralds have been a subject of fascination since antiquity — with Ancient Roman nobleman Pliny the Elder...
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