16.55 Ct Certified Natural Boulder Opal Loose Gemstones Cabochon Cut 24 x 15.6 x 5.1 mm

Boulder Opal is a unique and stunning variety of opal that forms within ironstone matrix rock, typically found in Queensland, Australia. It is characterized by vibrant flashes of color, often displaying a captivating play-of-color against the contrasting backdrop of the ironstone.

Here are some key features and characteristics of Boulder Opal:

1. Formation: Boulder Opal forms as thin veins or patches of opal within the cracks and crevices of ironstone boulders. The opal fills the cavities in the host rock, resulting in a distinctive pattern where the opal is naturally bonded to the ironstone.
2. Color and Play-of-Color: Boulder Opal exhibits a wide range of colors, including blues, greens, reds, and oranges. Its most prized feature is its play-of-color, which refers to the vibrant flashes of spectral colors that appear to move and change as the stone is viewed from different angles.
3. Matrix: The ironstone matrix in which Boulder Opal is found often forms interesting patterns and designs, adding to the gemstone’s visual appeal. The contrast between the colorful opal and the earthy tones of the matrix creates a striking aesthetic.
4. Durability: Boulder Opal is generally considered to be more durable than other types of opal, such as white opal or black opal, due to its ironstone backing. However, it still requires gentle care to avoid scratching or chipping.
5. Origin: The primary source of Boulder Opal is Queensland, Australia, particularly in regions such as Quilpie, Winton, and Koroit. These areas are known for producing some of the finest specimens of Boulder Opal in the world.
6. Uses: Boulder Opal is highly valued for its unique beauty and is often used in jewelry, particularly in pendants, earrings, and statement rings. Its striking appearance makes it a favorite among collectors and jewelry enthusiasts alike.
7. Ethical Considerations: When purchasing Boulder Opal, it’s important to ensure that it has been ethically sourced and mined in compliance with environmental and labor regulations.

Overall, Boulder Opal is a captivating gemstone prized for its vibrant colors, mesmerizing play-of-color, and distinctive matrix patterns. Whether worn as jewelry or admired in its natural form, Boulder Opal is sure to make a memorable impression.