Colour Changing Stone Royal Turkish Ring

Features Stone: The prominent feature is a large, smooth, oval "mood stone" that exhibits iridescent, swirling colors, appearing in shades of blue, green, and yellow . 
Function: This type of stone is sensitive to temperature changes, which causes its color to shift, supposedly reflecting the wearer's mood or body temperature. 
Band: The ring features a wide, antique-style metal band, likely sterling silver or silver-plated, with detailed, engraved patterns and vertical line accents on the sides of the setting. 
Style: The overall design is vintage or bohemian in style, with a bold, statement-piece appearance.