Rosette inclusion surrounding a mica crystal in an unheated Mozambique ruby, seen in transmitted light.

Natural Ruby  •  Mozambique  •  Enhancements: None Detected (None)  •  Lighting Conditions: Fiber Optic: Transmitted
Photographer: Richard W. Hughes  •  Image Number: A-001-2005-3

Pardieu, V., Sangsawong, S. et al. (2013) Rubies from the Montepuez area (Mozambique). Gemological Institute of America, October 5, 84 pp.; RWHL*.

Rosette inclusion surrounding a mica crystal in an unheated Mozambique ruby, seen in reflected light.

Natural Ruby  •  Mozambique  •  Enhancements: None Detected (None)  •  Lighting Conditions: Fiber Optic: Diffuse Oblique
Photographer: Richard W. Hughes  •  Image Number: A-001-2005-2

Pardieu, V., Sangsawong, S. et al. (2013) Rubies from the Montepuez area (Mozambique). Gemological Institute of America, October 5, 84 pp.; RWHL*.

Rosette inclusion surrounding a mica crystal in an unheated Mozambique ruby, seen in reflected light.

Natural Ruby  •  Mozambique  •  Enhancements: None Detected (None)  •  Lighting Conditions: Fiber Optic: Diffuse Oblique
Photographer: Richard W. Hughes  •  Image Number: A-001-2005-1

Pardieu, V., Sangsawong, S. et al. (2013) Rubies from the Montepuez area (Mozambique). Gemological Institute of America, October 5, 84 pp.; RWHL*.

Growth tube with epigenetic iron-oxide staining in an untreated ruby from Mozambique. Positioned along the rhombohedron edge, this superficially resembles a boehmite needle, but there is no associated twinning.

Natural Ruby  •  Mozambique  •  Enhancements: None Detected (None)  •  Lighting Conditions: Fiber Optic: Oblique
Photographer: Richard W. Hughes  •  Image Number: A-001-1989-1

Pardieu, V., Sangsawong, S. et al. (2013) Rubies from the Montepuez area (Mozambique). Gemological Institute of America, October 5, 84 pp.; RWHL*.

Tiny rounded grains of pargasite (transparent) and chromite (black) in an untreated Mozambique ruby.

Natural Ruby  •  Mozambique  •  Enhancements: None Detected (None)  •  Lighting Conditions: Fiber Optic: Transmitted
Photographer: Richard W. Hughes  •  Image Number: A-001-1982-2

Pardieu, V., Sangsawong, S. et al. (2013) Rubies from the Montepuez area (Mozambique). Gemological Institute of America, October 5, 84 pp.; RWHL*.

Lovely example of a rutile needle with attached daughter crystal in a ruby from Montepuez, Mozambique.

Natural Ruby  •  Mozambique  •  Enhancements: None Detected (None)  •  Lighting Conditions: Fiber Optic: Diffuse Overhead
Photographer: E. Billie Hughes  •  Image Number: A-001-1799-1

Pardieu, V., Sangsawong, S. et al. (2013) Rubies from the Montepuez area (Mozambique). Gemological Institute of America, October 5, 84 pp.; RWHL*.

Sharp angular growth zoning is commonly seen in rubies from Mozambique’s Montepuez region.

Natural Ruby  •  Mozambique  •  Enhancements: None Detected (None)  •  Lighting Conditions: Diffuse Light Field (Transmitted Light)
Photographer: E. Billie Hughes  •  Image Number: A-001-1800-1

Pardieu, V., Sangsawong, S. et al. (2013) Rubies from the Montepuez area (Mozambique). Gemological Institute of America, October 5, 84 pp.; RWHL*.

This Mozambique ruby was heated after it was cut and not repolished, leaving evidence of the treatment on is surfaces.

Natural Ruby  •  Mozambique  •  Enhancements: Heat (H)  •  Lighting Conditions: Fiber Optic: Diffuse Overhead
Photographer: Richard W. Hughes  •  Image Number: A-001-1747-1

Hughes, R.W., Manorotkul, W. et al. (2017) Ruby & Sapphire: A Gemologist's Guide. Bangkok, Lotus Publishing, 816 pp.; RWHL*.

Small mica crystals with surrounding “rosettes” are common and welcome sights in rubies from Montepuez, Mozambique.

Natural Ruby  •  Mozambique  •  Enhancements: None Detected (None)  •  Lighting Conditions: Fiber Optic: Overhead
Photographer: Richard W. Hughes  •  Image Number: A-001-1746-1

Pardieu, V., Sangsawong, S. et al. (2013) Rubies from the Montepuez area (Mozambique). Gemological Institute of America, October 5, 84 pp.; RWHL*.

Undissolved rutile silk in the basal plane of this ruby from Montepuez, Mozambique, creates a lovely pattern.

Natural Ruby  •  Mozambique  •  Enhancements: None Detected (None)  •  Lighting Conditions: Fiber Optic: Diffuse Overhead
Photographer: Richard W. Hughes  •  Image Number: A-001-1413-1

Pardieu, V., Sangsawong, S. et al. (2013) Rubies from the Montepuez area (Mozambique). Gemological Institute of America, October 5, 84 pp.; RWHL*.

Angular growth zoning is often seen in rubies from Montepuez, Mozambique.

Natural Ruby  •  Mozambique  •  Enhancements: None Detected (None)  •  Lighting Conditions: Diffuse Light Field (Transmitted Light)
Photographer: Richard W. Hughes  •  Image Number: A-001-1144-1

Pardieu, V., Sangsawong, S. et al. (2013) Rubies from the Montepuez area (Mozambique). Gemological Institute of America, October 5, 84 pp.; RWHL*.

A solidified droplet of glass was found on the surface of this Mozambique ruby, thus suggesting it had been subjected to artificial heat treatment.

Natural Ruby  •  Mozambique  •  Enhancements: Heat (H)  •  Lighting Conditions: Fiber Optic: Diffuse Overhead
Photographer: Richard W. Hughes  •  Image Number: A-001-0953-1

Pardieu, V., Saeseaw, S. et al. (2015) "Low temperature" heat treatment of Mozambique ruby: Results report. Gemological Institute of America, 16 April, 34 pp.; RWHL*.