One of six end members in the garnet family. Pure pyrope does not exist; a certain proportion of almandine and/or spessartine is always mixed in. To be classified as pyrope, SG should be <3.93 and RI <1.77 (there might be variations in the limit values depending on the source). The properties below are given for the entire pyrope group, but to distinguish the classic "standard pyrope," its values are indicated in parentheses. Chrome and pastel pyropes have slightly lower values.

Physical Properties:

Chemistry: Mn+23Al2(SiO4)3
Hardness: 7.25
SG: 3.65–3.93 (3.80–3.93)
Cleavage: None
Fracture: Sometimes slightly brittle
Heat Sensitivity: None

Optical Properties:

RI: 1.72–1.77 (1.75–1.77)
Dispersion: 0.026 (medium)
Double Refraction: None
Pleochroism: None
Critical Angle: 35°

Facet Angles (Pavilion/Crown):

Vargas: 41°/40°
Olson: 39°/37°
Soukup: 42°/37°
Roth: 42°/37°
MDR: 42°/37°
Schlagel: 40°/36°
Hashnu: 41°/39°
Sinkankas: 40°/40°
GIA: 42°/37°
Perkins: 42°/37°
Raytech: 40°/38°
Cornwall: 41°/34°
Weikoff: 42°/39°
Carroll: 42.1°/35.3°

Cutting lap:

Medium - fine

Facet Polishing:

Vargas: Aluminum oxide on tin/lead, tin oxide on tin
Olson:  Chromium oxide on tin
Soukup: Aluminum oxide on tin or tin/lead
Christiansen: Aluminum oxide on tin/lead, tin oxide on tin
Perkins: Aluminum oxide on BATT or Corian
MDR: Tin or aluminum oxide on tin, aluminum oxide on type metal

Cabochon Polishing:

Olson: Chromium oxide on leather
Christiansen: Aluminum, tin, or chromium oxide on leather or wood
Cox: Aluminum or chromium oxide on leather, cerium oxide on felt
Covington: Chromium or cerium oxide on felt


For best yield




Pyrope is often too brittle for coarse or new sanding discs.

Pyrope rough

Pyrope on Gemdat

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