Report · b0e82487-7e07-4d40-85b2-c299218686b3

Gemstone Identification Report #084-2026

Tourmaline — Africa

Issued

07/04/2026

Olena Rybnikova, PhD · GIA

The main absorption bands are in blue region (350-450nm) and red to infra-red region (720nm) corresponds to iron and resulting in yellowish green color of the tourmaline. See the Mineral Spectroscopy Server (http://minerals.gps.caltech.edu/) for comparison.

The Raman spectrum corresponds to elbaite tourmaline. See the RRUFF database (https://www.rruff.net/) for comparison

Origin

—

Species

Tourmaline

Specimen

Tourmaline

Variety

Oval

Weight

1.170 ct

Dimensions

7.7 x 6.0 x 3.4

R.I.

1.620 - 1.648

D.R.

0.028

Pleo.

Moderate green to yellowish green

Fluor. LW

LW (365 nm) - inert

Fluor. SW

SW (254 nm) - inert

Chelsea

No reaction

Microscope

Thread-like liquid and gas inclusions (trichites) - typical for tourmalines.

Treatment

Untreated

Report · b0e82487-7e07-4d40-85b2-c299218686b3

Gemstone Identification Report #084-2026

Tourmaline — Africa

Issued

07/04/2026

Olena Rybnikova, PhD · GIA

Origin

—

Species

Tourmaline

Specimen

Tourmaline

Variety

Oval

Weight

1.170 ct

Dimensions

7.7 x 6.0 x 3.4

R.I.

1.620 - 1.648

D.R.

0.028

Pleo.

Moderate green to yellowish green

Fluor. LW

LW (365 nm) - inert

Fluor. SW

SW (254 nm) - inert

Chelsea

No reaction

Microscope

Thread-like liquid and gas inclusions (trichites) - typical for tourmalines.

Treatment

Untreated

No description provided.