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Antique Flat Top Single Bevel Genuine Black Onyx
Antique Flat Top Single Bevel Genuine Black Onyx
Antique Flat Top Single Bevel Genuine Black Onyx
Antique Flat Top Single Bevel Genuine Black Onyx
Otto Frei

Antique Flat Top Single Bevel Genuine Black Onyx

Part # 947-132 Only 2 left Weight <0.1 lb / <5 g
$7.00
Select Size: 12x10mm
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Availability Sold out

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Description

Black Onyx, also known as black agate, is dyed black chalcedony. Chalcedony is composed of microscopic quartz crystals not visible to the naked eye. Natural black chalcedony is exceedingly rare — virtually all black chalcedony on the market is grey chalcedony that has been chemically treated to achieve its characteristic deep, shiny black color. Black Onyx has long been one of the top-selling chalcedony gemstones and was a hallmark material in Art Deco jewelry design. These antique flat top, single bevel cabochons offer a classic profile well suited for rings, pendants, and statement pieces requiring a bold, uniform black stone.

Care is straightforward: clean with warm, soapy water. Use of an ultrasonic or steam cleaner is generally considered safe for this material.

Features

  • Antique flat top with single bevel profile
  • Genuine black onyx (dyed black chalcedony)
  • Uniform opaque black color throughout
  • Dyed treatment for consistent, deep black appearance
  • Suitable for a variety of jewelry settings and metalsmithing applications
  • Safe for ultrasonic and steam cleaning

Specifications

Stone Type Black Onyx (Dyed Black Chalcedony)
Profile Antique Flat Top, Single Bevel
Treatment Dyed
Color Uniform Opaque Black
Composition Microcrystalline Quartz (Chalcedony)
Care Warm soapy water; ultrasonic and steam cleaning generally safe

Available Options

Part # Size Notes
947-132 12x10mm —
947-133 14x12mm Includes hole for diamond setting
947-134 16x12mm —

Specifications

Brand
Otto Frei
Part #
947-132
Type
Cabochon
Dimensions
0.1 in x 0.1 in x 0.1 in
Stone Type
Black Onyx (Dyed Black Chalcedony)
Profile
Antique Flat Top, Single Bevel
Treatment
Dyed
Color
Uniform Opaque Black
Composition
Microcrystalline Quartz (Chalcedony)
Care
Warm soapy water; ultrasonic and steam cleaning generally safe
California Prop 65 Warning California Prop 65 Warning:
Cancer and Reproductive Harm. www.P65warnings.ca.gov.

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