Report · 4fd8b5ff-38b5-4742-80e5-e1891b663b89

Gemstone Identification Report #085-2026

Corundum — Madagascar

Issued

07/04/2026

Olena Rybnikova, PhD · GIA

This spectrum is fully consistent with a natural iron- and titanium-bearing blue sapphire colored by the classical Fe²⁺–Ti⁴⁺ IVCT mechanism due to the presence of 450 nm band.

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

Origin

Madagascar

Species

Corundum

Specimen

Sapphire

Variety

Oval

Weight

0.900 ct

Dimensions

6.3 x 5.5 x 3.0

R.I.

1.761 - 1.769

D.R.

0.008

Pleo.

Weak green to yellowish green.

Fluor. LW

LW (365 nm) - inert

Fluor. SW

SW (254 nm) - inert

Chelsea

No reaction

Microscope

Minute frosted feathers, polysynthetic twinning planes, colorless crystal inclusion with no tension cracks.

Treatment

Untreated

Origin

Madagascar

Report · 4fd8b5ff-38b5-4742-80e5-e1891b663b89

Gemstone Identification Report #085-2026

Corundum — Madagascar

Issued

07/04/2026

Olena Rybnikova, PhD · GIA

Origin

Madagascar

Species

Corundum

Specimen

Sapphire

Variety

Oval

Weight

0.900 ct

Dimensions

6.3 x 5.5 x 3.0

R.I.

1.761 - 1.769

D.R.

0.008

Pleo.

Weak green to yellowish green.

Fluor. LW

LW (365 nm) - inert

Fluor. SW

SW (254 nm) - inert

Chelsea

No reaction

Microscope

Minute frosted feathers, polysynthetic twinning planes, colorless crystal inclusion with no tension cracks.

Treatment

Untreated

Origin

Madagascar

No description provided.