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Spectrum collection is inspired by the prism of light. Characterized by colorful radiance, flexible geometry and multiple materials, Koulis further develops his forms. Following his Mediterranean free spirit, he creates cuffs and rings with rotatable parts, composing fascinating pieces, which prove his expert technical ability in stones cutting and setting. White and colored diamonds in diverse cut variations, lapis, corals, sapphires, pearls and even iron oxide, such as cold hematite are composing edgy aesthetic works of art.