Fall 2025 G&G Publication Information

Editorial Staff

Production Staff

Editorial Review Board

About the Cover

An assortment of colorless macle and octahedral diamond crystals, ranging in size from 0.52 to 2.53 ct, are pictured against samples of kimberlite host rock. The back cover features a closer look at the largest macle specimen. One of this issue’s feature articles investigates the morphological changes of contact-twinned macle diamonds during the growth process. Photos by Kevin Schumacher. Kimberlite from Kelsey Lake, Colorado, gift of Dr. James E. Shigley; 0.52 ct octahedral diamond gift of Dr. D. Vincent Manson; 1.77 ct octahedral crystal gift of George Kaplan; other diamonds from the GIA Museum collection.

Printing is by L+L Printers, Carlsbad, CA.

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© 2025 Gemological Institute of America
All rights reserved.
ISSN 0016-626X

Subscriptions

Copies of the current issue may be purchased for $35.95 plus shipping. Subscriptions are $95.99 for one year (4 issues) in the U.S. and $119.99 elsewhere. Canadian subscribers should add GST. Discounts are available for renewals, group subscriptions, GIA alumni, and current GIA students. To purchase print subscriptions, visit store.gia.edu or contact gandg@gia.edu. For institutional rates, contact Customer Service.

Database Coverage

Gems & Gemology’ s impact factor is 2.6, according to the 2024 Journal Citation Reports by Clarivate Analytics (issued June 2025). G&G is abstracted in Thomson Reuters products (Current Contents: Physical, Chemical & Earth Sciences and Science Citation Index—Expanded, including the Web of Knowledge) and other databases:

Manuscript Submissions

Gems & Gemology, a peer-reviewed journal, welcomes the submission of articles on all aspects of the field. Please see the Author Guidelines at www.gia.edu/gems-gemology-author-guidelines or contact the editors (gandgeditorial@gia.edu). Letters on articles published in G&G are also welcome. Please note that Field Reports, Lab Notes, Gem News International, Micro-World, Colored Stones Unearthed, Diamond Reflections, Charts, and In the Spotlight are not peer-reviewed sections but do undergo technical and editorial review.

Copyright and Reprint Permission

Abstracting is permitted with credit to the source. Libraries are permitted to photocopy beyond the limits of U.S. copyright law for private use of patrons. Instructors are permitted to reproduce isolated articles and photographs/images owned by G&G for noncommercial classroom use without fee. Use of photographs/images under copyright by external parties is prohibited without the express permission of the photographer or owner of the image, as listed in the credits. For other copying, reprint, or republication permission, please contact the editors (gandgeditorial@gia.edu).

Gems & Gemology is published quarterly by the Gemological Institute of America, a nonprofit educational organization for the gem and jewelry industry.

Any opinions expressed in signed articles are understood to be opinions of the authors and not of the publisher.