Article Search Results

Types

Articles (206)

Content Type

Lab Notes (10) Gem News International (13) Reviews (2) Abstract (9) Feature (10)

Reviewed

Peer Reviewed (145)

Topics

See All Topics

Gemstones

Diamond (43) Sapphire (31) Pearl (25) Ruby (25) Emerald (22) See All Gemstones

XClear Selections

Figure 1. A good-quality 88.25 ct “chameleon” amber with a red bodycolor displaying a vivid green fluorescence color that appears to float on the surface. Photo by Yan Li.

The Special Color Effect in “Chameleon” Amber

Jinfeng Yang, Yan Li, and Youzhi Liang, November 3, 2023

An examination of three Burmese chameleon amber specimens using 3D fluorescence spectroscopy.

Figure 1. Faceted Oregon sunstone crystals (2.75–7.71 ct) representing the variety of colors observed. Photo by Adriana Robinson. Courtesy of the GIA Museum. Gifts of Western Ventures (pear shape), Dust Devil Mining Co. (oval), and John and Laura Ramsey (emerald cut on the far right).

Special Colors and Optical Effects of Oregon Sunstone: Absorption, Scattering, Pleochroism, and Color Zoning

Shiyun Jin, Aaron C. Palke, Nathan D. Renfro, and Ziyin Sun, November 3, 2023

Details the colors and optical effects caused by metallic copper inclusions in this gem-quality feldspar.

CVD Diamonds with Invisible Markings

Shoko Odake and Priyanka Kadam, August 4, 2023

A new type of invisible marking in CVD diamonds suggests a possible security measure.

Figure 1. The 169.05 ct filled pearl, viewed from its face (left) and base (right). Note the indented feature on the base through which the filler material was inserted prior to plugging. Photos by Gaurav Bera.

A Partially Hollow Natural Blister Pearl Filled with Foreign Materials

Roxane Bhot Jain, Abeer Alalawi, Nicholas Sturman, and Chunhui Zhou, January 25, 2023

A very large baroque white pearl is further examined in the Mumbai laboratory due to its suspicious heft.

Laser cavities under different lighting conditions.

Graphitic Cavities on Diamond

Troy Ardon, July 22, 2020

An unusual series of graphitic cavities discovered on a star facet in a near-colorless round brilliant diamond may be explained by laser sawing.

Figure 1. Twelve Chilean abalone cultured pearls and two red abalone (<i>Haliotis rufescens</i>) shells with attached cultured shell blisters, as well as three 7 mm traditional freshwater shell bead nuclei used to culture the pearls. Photo by Emily Lane.

Bead Cultured Abalone Pearls from Chile

Artitaya Homkrajae, Amiroh Steen, Matthew Hardman, Ziyin Sun, Rubén Araya Valencia, and Jaime Pablo Maturana Zuñiga, May 23, 2023

A study of abalone bead cultured pearls from a new pearl culturing technique tested in Chile.

Figure 1. A heart-shaped golden South Sea pearl pendant measuring 17.78 × 11.65 × 9.07 mm and weighing 1.93 g (including the 18K yellow metal findings). Photo by Sood Oil (Judy) Chia.

Heart-Shaped Golden South Sea Cultured Pearl

Joyce Wing Yan Ho and Emiko Yazawa, May 23, 2023

The remarkable use of an atypical bead nucleus to achieve the perfect heart shape suggests recent improvements in pearl culturing techniques.

Figure 1. These handcrafted jewelry pens are created with silver, embellished with 24K gold, and inlaid with diamond, sapphire, and crushed emerald. Left: The peacock design is a miniature painting coated in clear enamel. Right: A pen with fine metal engraving and dimming just below the 24K gold nib. Photo by Robert Weldon; courtesy of Zeki Karaca.

Zeki Karaca Jewelry: Luxury Pens

Jennifer Stone-Sundberg and Mimi Travis, May 23, 2023

One-of-a-kind bejeweled pens from Zeki Karaca caught the attention of attendees at the GJX show.

Figure 1. Two atypical bead cultured pearls recovered from <em>Pinctada radiata</em> mollusks from Abdulla Al Suwaidi’s farm in the UAE. Pearl A (left) weighs 0.87 ct, and pearl B (right) weighs 0.94 ct. Photo by Gaurav Bera.

Pinctada radiata Atypical Bead Cultured Pearls from the UAE

Abeer Al-Alawi, Lubna Sahani, Nicholas Sturman, and Chunhui Zhou, May 23, 2023

GIA’s Mumbai laboratory reports on pearl samples from a culturing experiment by the Suwaidi Pearl Farm in the UAE.

Figure 1. Yellow to greenish yellow faceted cerium-doped YAG “lumogarnets” ranging from 4 to 12 ct apiece. Photo by Lisa Kennedy; courtesy of Turtle’s Hoard.

Luminescent Synthetic Garnet-Like Crystals

Lisa Kennedy, May 23, 2023

Unique rough and faceted luminescent synthetic garnet-like crystals were on display at the 22nd Street show in Tucson.

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Gemstones

Find a Retailer

Shop the Campus Store

Subscribe to Knowledge Rocks Emails

Learn About Diamond Origin Reports