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Gemstone Optical Properties

…Inside gems, mineral inclusions may act like straws and air bubbles in water. If the inclusions are transparent, how much they stand out relates…

Garnet Buying Guide

…contain horsetail inclusions. Beautiful to observe, they also give the stone a unique character. 4.6-ct demantoid with horsetail inclusions

Agate Buying Guide

…patterns of inclusions. Moss agates are one of the most sought-after varieties, with green inclusions that resemble moss. Similarly, dendritic…

Mechanical Gemstone Cleaning

Inclusions, some visible to the naked eye and others microscopic, are present in many gems. Some add great beauty and interest to a gemstone. However,…

Appraising Opals

…Cut: Too thin, too thick, or uneven thickness Imperfections: Considerable matrix or other inclusions visible on the crown Commercial Colors:…

HPHT Diamond Update

…look for frosted naturals, frosted feathers, faceted girdles with bearding, melted inclusions, or melted graining on the girdle. These inclusions