Necklace in pink gold with diamond signature and stone combination Rock Crystal Blues, Green Aventurine For Ever, Aventurine Mystery and Eclectic Blueitem : 20C17Rb9_90 BIGLI jewels have been made with care in 18 Kt gold, carefully selected precious stones and high-quality diamonds (Clarity VS1-VS2 TW). Gemstones available in more than 40 colors.