AI Appraisal Estimate

This item is a contemporary triangular-shaped art glass bowl produced by the German glassware brand Leonardo. The vessel features a thick-walled construction with a soft, rounded triangular profile, often referred to as a Reuleaux triangle shape. The color palette utilizes a sophisticated ombré or gradient effect, transitioning from a deep cobalt blue at the center of the base to a clear or slightly frosted translucent perimeter. The rim is finished with a distinct black or very dark navy band that defines the geometric silhouette. A notable marking is the original square blue and white adhesive brand label affixed to the interior side, which displays the Leonardo 'cloud' logo and name. The glass appears to be machine-blown or press-molded with high-quality clarity and significant weight, characteristic of modern European decorative glass. The surface displays a lustrous, polished finish with no immediate visible cracks or chips, though minor shelf wear on the base is expected for a pre-owned item of this style. This piece likely dates from the late 20th to early 21st century, representing modern minimalist European design.

I have examined the provided description and visual characteristics of this Leonardo triangular art glass bowl. The item appears to be in very good vintage condition, retaining its original brand label which significantly aids in identifying the piece as an authentic production by the German firm Glaskoch (Leonardo). The ombr gradient and thick-walled construction are typical of the brand's contemporary 'Alabastro' or similar art glass lines from the late 1990s through the early 2000s. Market demand for Leonardo glassware is consistent but generally limited to the secondary decorative market rather than high-end fine art auctions. The mass-produced nature of these pieces ensures a steady supply, which keeps the valuation within a modest range. Comparables on secondary platforms like eBay and Etsy for similar modern German art glass pieces typically fall within the forty to sixty dollar range depending on size and color popularity. The presence of the original sticker adds a premium for collectors but does not push the value into the 'fine art' category. Please note that this appraisal is based solely on digital representations. A physical inspection would be required to rule out internal stress fractures or microscopic 'flea bites' on the rim not visible in photographs. Furthermore, verifying the exact weight and checking for a laser-etched signature on the base (sometimes present alongside stickers) would be necessary for a definitive valuation. This estimate assumes no major structural damage and typical light shelf wear to the base profile.