COSIERO
Korean lip plumpers
Korean color makeup brand born from Siero Cosmetic, under the slogan “Color your Volume”. Home of the Jealousy Plumper.
- Born from Siero Cosmetic, whose name comes from the Italian word for serum
- Lip plumpers that add color and a natural-looking volume, according to the brand
- Easy, quick formulas made for everyday makeup, according to the brand
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From skin prep to lips, an easy everyday look from COSIERO.
PREPCosiero Wake Up Toner Pad 60p 145ml
PRIMERCosiero Serum Sun Primer 30ml
BASECosiero Coco Aqua Black Cushion
LIPSCosiero Jealousy PlumperAll COSIERO
13 products
Which COSIERO product is right for you?
Six families, from the signature plumper to base and skin prep.
Jealousy PlumperThe brand’s signature lip plumperJealousy Plumperfrom $23
Jealousy ArchiveA plumper in a range of colorsJealousy Archive Lip Plumperfrom $27
Jealousy Glow TintA plumper that tints the lipsJealousy Glow Tint Plumperfrom $23
More plumpersOther plumper shades and texturesDamask Melrose, Hippie Grow Velvet, Deeper Plumperfrom $19
Lip marker & balmEasy color for the lipsVivid Lip Marker, Dustin Dun Tinted Lip Balmfrom $20
Face, eyes & skin prepBase, sparkle and skin prepCoco Aqua Black Cushion, Serum Sun Primer, Multi Glitter Water Glow, Wake Up toner pad & toner creamfrom $20The COSIERO guide
About COSIERO
COSIERO is a Korean color beauty brand built on the know-how of Siero Cosmetic, whose name comes from siero, the Italian word for serum. According to the brand, COSIERO keeps the familiar Siero feel and adds color, under the slogan “Color your Volume”.
The brand says it aims for a clear, healthy glow and a natural-looking volume, with a wide choice of shades so everyone can find colors that suit their skin tone and mood.
The Jealousy plumpers
Lip plumpers are at the heart of COSIERO. According to the brand:
- Jealousy Plumper: the brand’s signature plumper, made to bring moisture, volume and color to the lips.
- Jealousy Archive Lip Plumper: the plumper offered in a selection of colors.
- Jealousy Glow Tint Plumper: a plumper that tints the lips with its color.
Kool Seoul also carries the Damask Melrose Plumper, the Hippie Grow Velvet Lip Plumper and the Deeper Plumper.
Lip marker and lip balm
The Vivid Lip Marker is offered by the brand in 8 shades, from red and pink to coral and deep cherry. For a softer touch of color, try the Dustin Dun Tinted Lip Balm.
Base, eyes and skin prep
For the face, the Coco Aqua Black Cushion is presented by COSIERO as a cushion focused on the balance between oil and moisture. Kool Seoul also carries the Serum Sun Primer, the Multi Glitter Water Glow for the eyes, and two skin-prep products: the Wake Up Toner Pad and the Wake Up Toner Cream.
How to build a COSIERO look
1. Prep: wipe the skin with a Wake Up Toner Pad.
2. Primer: apply the Serum Sun Primer.
3. Base: pat on the Coco Aqua Black Cushion.
4. Lips: finish with a Jealousy Plumper, or a Vivid Lip Marker for more color.
Buying COSIERO at Kool Seoul
We buy every COSIERO product in Korea, from the brand and official Korean retailers, and ship it from our office in Itaewon, Seoul. Orders are prepared in 2–5 business days, then K-Packet takes 7–14 business days and DHL Express 2–5, both tracked. Prices are in USD; duties or import taxes may apply on arrival depending on your country.
Questions? We answer.
Is the COSIERO sold on Kool Seoul authentic?
Yes. We buy COSIERO in Korea from the brand and official Korean retailers, and ship it from our office in Seoul.
Are COSIERO and Siero Cosmetic the same brand?
According to the brand, COSIERO is a new color beauty brand built on the feel and know-how of Siero Cosmetic. Some products may still carry the Siero name.
Which COSIERO plumper should I choose?
The Jealousy Plumper is the brand’s signature plumper. The Jealousy Archive Lip Plumper comes in a selection of colors, and the Jealousy Glow Tint Plumper tints the lips with its color.
What does “Color your Volume” mean?
It is COSIERO’s slogan: the brand focuses on colors that add a fresh glow and a natural-looking volume, according to COSIERO.
How long does shipping to the US take?
We prepare your order in 2–5 business days. K-Packet then takes 7–14 business days, DHL Express 2–5, both tracked.
Will I pay import duties?
Duties or import taxes may apply on arrival depending on your order. They are set by your local authorities and paid by the recipient.
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Updated October 2026 · Prices in USD