Polish artist Agnieszka Pilat poses with the artwork of her robot painting dogs – Basia Spot and Bunny Spot – who have become artists painting on canvases with their paws, at the launch of the National Gallery of Victoria (NGV) Triennial 2023 in Melbourne on April 5, 2023. Pilat works with the Boston Dynamics dogs, training them to paint autonomously through AI technology individually and collaboratively, and will be part of more than 100 local and international artists, designers and collectives presenting at the exhibition opening in December. (Photo by William West/AFP Photo)

A gallery assistant poses for a photograph with an artwork entitled “John Perreault, 1972” by US artist Alice Neel during a press preview of “Alice Neel: Hot Off The Griddle” at the Barbican Art Gallery in London on February 15, 2023. (Photo by Justin Tallis/AFP Photo)

“Sociomobile” by Jasleen Kaur goes on view as part of the 2024 Turner Prize exhibition at TATE Britain on September 24, 2024 in London, England. This year marks the 40th anniversary of the Turner Prize, and it returns to Tate Britain for the first time since 2018. The prestigious award is presented annually to a British artist who has delivered an exceptional exhibition or presentation of their work. The four artists shortlisted for the 2024 Turner Prize are Pio Abad, Claudette Johnson, Jasleen Kaur, and Delaine Le Bas. (Photo by Tristan Fewings/Getty Images)

Sophie Roberts admires Angel of the Trench by artists Laura and Paul Carey at the Himalayan Garden and Sculpture Park near Masham, North Yorkshire, UK on October 14, 2025. (Photo by James Glossop/Times Media Ltd)

A woman poses for a souvenir photo with a cat statue on display at the Shenzhen Bay commercial district, in Shenzhen, China's Guangdong province, Monday, September 15, 2025. (Photo by Andy Wong/AP Photo)

People visit an installation by the American sculptor, Carole Feuerman, during the exhibition of her hyperrealistic sculptures at Pier 17 in the trendy neighbourhood of Seaport in New York City on June 1, 2024. (Photo by Milo Hess/ZUMA Press Wire/Rex Features/Shutterstock)

The Soulton Long Barrow in Shropshire, UK on January 5, 2025. The main chamber is aligned so that at winter solstice and for a few weeks after, the sun sets directly through the stained glass door, resulting in a beautifuil rainbow of light to flood through the chamber. (Photo by Andrew Fusek Peters/South West News Service)

There is an endless bounty of eye-catching gemstones throughout the world and this spectacular boulder opal is one unique beauty that looks like a shimmering crystal encased in a tree fossil. Its opalescent sheen seeps through the cracks of the seemingly wooden rings in lustrous hues of emerald green and aqua blue. Like something out of a fairy tale, the triangular piece radiates through an organic pattern mimicking the growth rings of tree.