mineral

Costume Jewelry with Synthetic Gemstones

Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)

Hardness: 5.5 to 8.5 (Mohs scale), Color: Multi-colored (synthetic dyes), Luster: Vitreous to Adamantine, Structure: Amorphous or Isometric, Cleavage: None

Hardness: 5

Identified May 24, 2026More mineral →

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Physical properties

Hardness: 5.5 to 8.5 (Mohs scale), Color: Multi-colored (synthetic dyes), Luster: Vitreous to Adamantine, Structure: Amorphous or Isometric, Cleavage: None

Formation & geological history

Laboratory-grown or manufactured using the Czochralski process or melt-quenching. These materials are man-made to mimic natural gemstones and are often set in base metals or sterling silver.

Uses & applications

Used primarily in fashion jewelry, costume pieces, and affordable accessories to provide a high-sparkle aesthetic without the cost of precious stones.

Geological facts

Cubic Zirconia was first discovered as a natural mineral in 1937 but is so rare that almost every specimen found in jewelry today is lab-created. It is heavier than a diamond but not as hard.

Field identification & locations

Identify in the field by checking for excessive sparkle (fire), lack of natural inclusions under a loupe, and the presence of 'CZ' or '925' stamps on the metal setting. Commonly found in retail stores and thrift shops.

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