The Winter 2025 edition of InColor, Issue 53, features as always a selection of articles dedicated to the world of gems and jewelry. Among the main contributions is a technical analysis titled “Tanzanite and Zoisite” by Clemens Schwarzinger, focusing on the tanzanite from Merelani, Tanzania. The article examines the stone’s physicochemical characteristics and the geological context in which it is mined. Discovered in 1967 and renowned for its intense blue color, tanzanite was initially collected by the Maasai communities, who mistook it for sapphire, before it was identified as a variety of zoisite. The article also outlines the regulation introduced by the Tanzanian government in 1990, which has since influenced extraction techniques now conducted at depths of hundreds of meters. Although commercial availability remains stable, the search for high-quality rough crystals has become increasingly complex.
Richa Goyal Sikri recounts her experience as a moderator at a conference held during the Jewellery & Gem World Show in Hong Kong. The event, dedicated to the practical applications of artificial intelligence in the gems and jewelry sector, was organized by the Gübelin Gem Lab in collaboration with the CIBJO (World Jewellery Confederation). The conference explored the potential of technology to support gemological analysis and enhance production and trade.
Not to be missed is the section dedicated to the major auctions in the jewelry sector, which reports on the sales results from the Geneva auctions in November 2024 presented by Christie’s, Sotheby’s, and Phillips.
