Knowledge base

Rainbow Obsidian is a striking variety of natural volcanic glass prized for its shimmering, layered colors and smooth, glassy luster. Although less common than plain black obsidian, its unique optical effects — a result of microscopic layers and inclusions within the glass — have made it a favorite among collectors, jewelers, and those interested in […]

The mineral known as Snowflake Obsidian is a striking variety of volcanic glass that draws attention for its monochrome contrasts: deep, mirror-like black interrupted by delicate, flower-like white patches. Those patterns are not surface decorations but internal structures formed during the rock’s cooling and alteration. This article explores the origin, distribution, practical uses and cultural

Tektites are enigmatic droplets of silica-rich material that link terrestrial geology with cosmic events. Born from the extreme conditions of hypervelocity impacts, these pieces of natural glass scatter across the planet in characteristic patterns and have attracted the attention of scientists, collectors, and artisans for centuries. This article explores their origin, distribution, physical and chemical

Moldavites occupy a fascinating intersection between geology, history and human culture. These distinctive olive to bottle green glasses — the most famous members of the tektite family — are prized for their unusual origin, striking appearance and the stories that surround them. In this article I explore where they occur, how they formed, what people

Beryl Green is a subtle and often underappreciated member of the beryl family, occupying a niche between the faint pastel greens of common beryl and the intense hues of emerald. Although it lacks the blockbuster name recognition of its verdant cousin, it combines the solid physical qualities that make beryl a desirable material for both

Morganite Pink is a captivating member of the beryl family prized for its delicate blush tones and gentle sparkle. This article explores its geological origins, physical and chemical characteristics, a variety of colors and treatments, applications in contemporary and antique jewelry, and the broader cultural and commercial context surrounding this appealing gemstone. Throughout the text

Tsavorite is one of the most striking green gemstones discovered in the 20th century: a vivid, lively variety of grossular garnet prized by gemologists and jewelers alike. Combining the toughness of garnet with an emerald-like hue, this stone has gained an enthusiastic following among collectors and designers. The following article explores its origins, chemistry, geological

The deep, shifting blues and violets of Tanzanite have captured the imagination of gem collectors and jewelry lovers since the late 1960s. Found in a single, relatively small zone near the town of Merelani and the base of Mount Kilimanjaro, this gem’s rarity and striking appearance make it one of the most fascinating modern discoveries

The name Spinel Ruby evokes both history and confusion: a vivid red gemstone that for centuries was mistaken for true ruby, admired by monarchs and jewelers alike. Although today gemologists separate the two by chemistry and crystal structure, spinel continues to fascinate collectors, designers, and scientists. This article explores where spinel ruby occurs, how it

Kunzite is a visually striking pink to lilac variety of the mineral spodumene that has captured the attention of gem collectors, jewelers and metaphysical enthusiasts for more than a century. Its delicate hues, impressive crystal habits and occasional ability to yield very large, clean stones make it unique among gem materials. While prized mostly as