A hexagonal boundary, usually found in natural material, is observed in a synthetic star sapphire.

An insider’s view of the stunning world of inclusions.

Inclusions create chatoyancy in a colorless phenakite cabochon.

A musgravite specimen’s inclusions result in an optical phenomenon unusual for the material.

A carving identified as blue chalcedony shows evidence of epoxy resin treatment.

A cracked apatite specimen reveals hidden treasure.

This large marble-hosted occurrence in the Pamir Mountains is a potentially productive source of corundum, including ruby with a bright red color reminiscent of “pigeon’s blood” Burmese rubies.

Examines a form of asterism comprising two six-rayed stars, one white and one that exhibits the stone’s bodycolor. Firsthand accounts and a survey of patent documents reveal that diffusion has been used to create or enhance this optical phenomenon in synthetic and possibly natural corundum since the 1950s.

A guide to capturing gem inclusion scenes using practical equipment and techniques and the appropriate image-refining software.

Review of I Love Those Earrings: A Popular History from Ancient to Modern, by Jane Merrill with Chris Filstrup.

《纽约州矿物收藏指南》书评。

Review of Collector’s Guide to the Zeolite Group, by Robert J. Lauf.

评论 S.K. Samuels（S.K. 塞缪尔）的 Imperial Jade of Burma and Mutton-Fat Jade of India: Mining, Trade, and Use from Antiquity to the Present（《缅甸帝王玉和印度羊脂玉：从古至今的开采、贸易及使用》）。

评论 S.K. Samuels（S.K. 塞缪尔）的 Imperial Jade of Burma and Mutton-Fat Jade of India: Mining, Trade, and Use from Antiquity to the Present（《缅甸帝王玉和印度羊脂玉：从古至今的开采、贸易及使用》）。

3D 打印的潜能对珠宝设计和制造而言十分惊人，时间、精度和成本效益得到高度重视。

美しい宝石の採掘やカットが行われている、パキスタンの鉱山での本物の宝石採掘を、GIAフィールド宝石学者と共に冒険してください。 ヒマラヤ、カラコルム、ヒンドゥークシュ山脈がぶつかり合う、マルコ・ポーロの通った古いシルクロードの旅に、私たちと共に出かけます。