Black Fire Opal Round Cabochon

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Black Fire Lab Created Opal Round Flat Back Cabochon - 2mm/3mm/4mm/5mm/6mm/7mm/8mm

Product Information: 

Material: Black Fire Lab Created Opal
Color: Black/Rainbow
Stone Type: Cabochon
Unit of Measurement: Millimeters 
Stone Size: 2mm-8mm
Stone Thickness: 1-2.6mm
Stone Cut: 
Back Type: Flat Back
Quantity: 1-50 pieces
Material Information:
80% silica & 20% resin
Heat Resistance:
 Up to a rough estimate of 250 degrees Fahrenheit
MOHS Hardness: 

*Please keep in mind that each cabochon is unique and color may vary

These flat back stones are great for any beginner or expert crafter. The brilliant fire will bring a new level of shine to your jewelry or craft projects...

Color Description: 


SECONDARY COLORS:  Green, Red, Orange

Black Fire Lab Created Opal has been roasted in the depth of a roaring fire. This burnt stone dances with red, orange, and greens tones like a hot flame in the night. This Opal will fill you with a burning passion for your next project.

What is Black Fire Lab Created Opal?

Black Fire Opal is a synthetic lab-made material that consists of Silica and Polymer rather than hydrated silica (natural opal). The polymer stabilizes our opal which in turn makes it easier for jewelry making. You will experience less cracking and crazing that can be detrimental when using natural opal in jewelry. By using a polymer it also creates a slightly softer product making it superior for turning and cabbing. Our crushed opal does not fall victim to color fading and is resistant to chemicals such as acetone and alcohol. 

Our Lab Created Opal takes around one year to grow in a controlled environment. This is a complex process of layering to create the unique color patterns. This complex process is used to then create a rough cut of synthetic opal that is then made into cabochons. The cabochons are shaped and perfected into the many different sizes we offer. Due to the layering of vibrant bursts of color this makes each cabochon unique with its own blend of colors and patterns. 

Please keep in mind that the material can only withstand heat up to a rough estimate of 250 degrees Fahrenheit. Please proceed at your own risk.

Click Here to learn more about how lab opal is made...

Packaging, Sizing, and Quantities:


  • 2mm / 1.0mm
  • 3mm / 1.5mm
  • 4mm / 1.8mm
  • 5mm / 2mm
  • 6mm / 2.2mm
  • 7mm / 2.4mm
  • 8mm / 2.6mm


  • 1-50 Quantity Options
  • Example:
    1 stone = one loose stone
    5 stones = five loose stones
    10 stones = ten loose stones
    25 stones = twenty five loose stones
    50 stones = fifty loose stones


  • Loose Stones will be packaged in a resealable bag

The Uses Of Lab Created Opal Stones: 

Inlay Projects
Jewelry/Ring Making
Nail Art 
Wire Wrapping

Processing Times & Shipping Offers: 

  • Processing Times: 1-2 Business Days *Unless otherwise specified
  • US orders over $35 are eligible for Free First Class USPS Shipping (estimated 3-5 business days) 
  • US orders over $100 are eligible for Free Priority Flat Rate Shipping (estimated 1-3 business days)


Read our FAQ 

Check out our other Opal Stones! Black Fire Opal Faceted Stones or Black Fire Beads

Click Here to learn how to make opal cabochon earrings 

Contact Us: 

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Customer Reviews

Based on 1 review

These are wonderful! I milled a flat bottom shallow hole in a ring channel to hold it. Then paired it with "Black Fire" and it's great! Lots of fire & color.