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GIA's Gübelin Gem Project:

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

Figure 1. Two traditional Indian-style pearl nose rings (<em>nath</em>) set with colored gemstones and pearls measuring approximately 6.63 × 6.09 mm to 8.42 mm (left) and 5.38 mm to 8.02 × 7.61 mm (right). Photo by Gaurav Bera.

Pearls in Traditional Indian Nose Rings

Lubna Sahani, Abeer Al-Alawi, and Roxane Bhot Jain, November 3, 2023

Two Indian-style pearl nose rings are examined in the Mumbai laboratory.

Figure 1. Isognomon isognomon shell and blister. The shell measures approximately 107.76 × 72.39 mm. Photo by Gaurav Bera.

Shell Blister on an Isognomon isognomon Shell

Prasad Mane, Nishka Vaz, and Abeer Al-Alawi, November 3, 2023

An Isognomon isognomon shell with a blister feature is examined at GIA in Mumbai.

Figure 1. A white button-shaped atypical bead cultured pearl weighing 8.15 ct and measuring 11.73 × 11.35 × 9.03 mm. Photo by Gaurav Bera.

Flame-Like Surface Structure in a Nacreous Atypical Bead Cultured Pearl

Prasad Mane, Nishka Vaz, and Abeer Al-Alawi, November 3, 2023

A white button-shaped nacreous pearl displays rare flame-like structure.

Figure 1. A Bombay bunch consisting of nine hanks and 553 high-quality natural pearls ranging from 3.83 to 5.72 mm. Photo by Gaurav Bera.

A Traditional Bombay Pearl Bunch

Pfokreni Nipuni, Abeer Al-Alawi, and Roxane Bhot Jain, November 3, 2023

GIA’s Mumbai laboratory reports on the examination of an 80-year-old collection of pearls from the Arabian (Persian) Gulf.

Figure 1. A strand of baroque-shaped freshwater bead cultured pearls shown with two <em>Tridacna</em>-species mollusk shells from GIA’s shell reference collection. Each sample weighs approximately 20 ct, ranging from 16.73 × 12.58 × 12.49 mm to 18.98 × 13.53 × 13.43 mm. Photo by Nuttapol Kitdee.

Saltwater Clamshell Beads (Tridacna Species) Used in Freshwater Cultured Pearls

Kwanreun Lawanwong, August 4, 2023

A report from GIA’s Bangkok laboratory on freshwater bead cultured pearls with saltwater bead nuclei.

Figure 1. The cream-colored pearl weighing 0.23 ct and measuring 3.20 × 3.12 mm, shown against the anterior of a <em>Pinctada radiata</em> mollusk. Photo by Nuttapol Kitdee.

An Unusual Metallic Core in a Natural Pinctada radiata Pearl from Kuwait

Ravenya Atchalak, Kwanreun Lawanwong, Emiko Yazawa, and Abeer Al-Alawi, August 4, 2023

Examination of natural pearls from Kuwait reveals one with a suspected metal oxide at the core.

Figure 1. The white and cream non-nacreous pearl weighing 0.29 ct and measuring 3.75 × 3.55 mm. Photo by Gaurav Bera.

Calcite Present in a Pearl from Pinctada maculata

Anukul J. Belanke, Roxane Bhot Jain, Nishka Vaz, and Abeer Al-Alawi, August 4, 2023

Examination of a Pinctada maculata pearl reveals an interesting columnar calcite surface structure.

A 4.77 ct near-round white Tridacninae pearl exhibited an attractive sheen-like flame structure in a pattern resembling an eye when viewed in certain directions under a single white light source. Photomicrograph by Ravenya Atchalak; field of view 7.20 mm.

An “Eye” on a Tridacninae Pearl

Ravenya Atchalak, August 4, 2023

A Tridacninae pearl exhibits a flame structure resembling an eye.

Four non-bead cultured pearls (samples 1–4, left to right) weighing 0.22 to 4.84 ct. Photo by Gaurav Bera.

Fine Linear Structures in Non-Bead Cultured Pearls

Gauri Sarvankar, Abeer Al-Alawi, Karan Rajguru, and Roxane Bhot Jain, August 4, 2023

Analysis of internal structures in non-bead cultured pearls submitted to GIA’s Mumbai laboratory.

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