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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.

Figure 1. A: This Lace Ring is crafted in 18K rose gold with blackened gold lace, featuring a cultured freshwater pearl measuring 16.5 mm in diameter, enclosed by natural-color pink and lavender sapphire round brilliants weighing 2.86 carats total. The shank of the ring is embellished with 0.06 carats of diamonds. B: This Tahitian pearl Lace Ring is created in 18K white gold with sandblasted and blackened gold lace. The cultured Tahitian pearl measures 16.0 mm and is surrounded by round brilliant diamonds, 1.35 carats total. The rubies in the shank weigh a total of 0.08 carats. C: A handmade doily crocheted by Smith’s grandmother. Photos courtesy of Brenda Smith.

Brenda Smith Jewelry Designs

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

Award-winning jewelry designer Brenda Smith shares some of her creations at the AGTA GemFair in Tucson.

Identification of the Endangered Pink-To-Red Stylaster Corals by Raman Spectroscopy

Stefanos Karampelas, Emmanuel Fritsch, Benjamin Rondeau, Aude Andouche, and Bernard Métivier, April 13, 2009

All corals within the Stylasteridae family (including the Stylaster genus) are listed in Appendix II of CITES.

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