B.F.C. Lip duo. high-pigment gloss in diamond & high-shine lip gloss in siren DIAMOND - hydrating, non-sticky, long-lasting, & lightly plumping. our high-pigment gloss gives your lips extra shine with a smooth finish that you can build up to your desired intensity. that's beauty for certain. diamond is a shimmering, crystal-clear gloss with flecks of glitter. SIREN - high-shine. non-sticky finish. maximum impact. this lip gloss was made to flex. it delivers sheer, buildable color in a smooth, comfortable texture that glides on effortlessly and wears like a dream. with a light-catching shine and a weightless feel, it’s the final touch that hits every time. that’s beauty for certain. siren is a deep pink lip gloss with a sheer, buildable tint.