Article Search Results

Show Filters

Showing 129 results for "*"

Types

Articles (129)

Content Type

Lab Notes (8) Gem News International (5) Abstract (5) Feature (13)

Reviewed

Peer Reviewed (86)

Topics

See All Topics

Gemstones

Diamond (40) Emerald (18) Ruby (14) Sapphire (13) Pearl (11) See All Gemstones

XClear Selections

Dr. E. J. Gübelin Collection Peridot

Article

GIA's Gübelin Gem Project: Various Gems, Olivine - Rutile

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

Read More

Dr. E. J. Gübelin Collection Kornerupine

Article

GIA's Gübelin Gem Project: Various Gems, Kornerupine - Natrolite

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

Read More

Dr. E. J. Gübelin Collection Danburite

Article

GIA's Gübelin Gem Project: Various Gems, Danburite – Humite

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

Read More

Gubelin Cordierite - Iolite 34802 300x169

Article

GIA's Gübelin Gem Project: Various Gems, Barite - Cuprite

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

Read More

Dr. E. J. Gübelin Collection Apatite

Article

GIA's Gübelin Gem Project: Various Gems, Amblygonite - Axinite

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

Read More

Dr. E. J. Gübelin Collection Beryl

Article

GIA's Gübelin Gem Project:

Chemically pure beryl is colorless, but trace elements give rise to green, blue and pink/red colors.

Read More

Iridescence in iris quartz from Jalgaon, India

Causes of Iridescence in Natural Quartz

Xiayang Lin and Peter J. Heaney, May 8, 2017

Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.

Read More

Figure 1. The Heart of Australia, a 3,510 ct double pseudomorph ikaite-calcite-opal gem specimen, is considered one of the finest ever unearthed. Courtesy of Graeme Dowton.

Rare Double Pseudomorph Ikaite-Calcite-Opal

Si Athena Chen and Jennifer Stone-Sundberg, May 23, 2023

One of the finest specimens of double pseudomorph ikaite-calcite-opal ever unearthed was on display at the Pueblo Gem & Mineral Show.

Read More

Figure 1. This relatively new type of violet chalcedony from Ethiopia (here, 75–198 ct) displays a wonderful pattern of white orbs. Photo by Annie Haynes; courtesy of Orbit Ethiopia Plc.

New Violet Orbicular Chalcedony from Ethiopia

Nathan Renfro, May 23, 2023

Tumble-polished freeforms of violet chalcedony with orb-like structures from a new find in Ethiopia were on display at GJX.

Read More

Figure 1. Left: The mother shell (<em>Mercenaria mercenaria</em>) and an 18K gold ring featuring a 14.43 × 14.63 mm lilac quahog pearl. Right: A rare collection of round quahog pearls ranging from 5.65 to 12.33 mm in diameter and in colors from white and beige to deep purple and tan. Photos by Robert Weldon; courtesy of ECIJA.

Exceptionally Rare Pearls from ECIJA

Si Athena Chen and Chunhui Zhou, May 23, 2023

An impressive variety of natural, wild, nacreous, and non-nacreous pearls were on display at the GJX show.

Read More

Load More