ONYX GLEAM by Terviiix — Salon Performance, At Home
Terviiix Onyx Gleam Hair Straightener
Engineered for thick, coarse, and curly hair with professional-grade technology.
What Makes It Different?
4.7" Extra-Long Plate
Our extended 4.7-inch plates (30% longer than standard irons) allow you to grab wider sections of hair from root to tip in one go. Cover more hair in one pass.
80 Million Negative Ions
Argan Oil & Keratin infused ceramic plates glide smoothly to condition hair. 80 million negative ions seal the hair cuticle, lock in moisture, and deliver smooth, frizz-free shine that lasts all day.
3D Floating Plates
Auto-adjusts to hair thickness for even heat distribution. No hot spots. No pulling. Just smooth, consistent results from root to tip.
Full Plate-to-Plate Contact
Our precision-engineered 3D floating plates deliver full plate-to-plate contact from edge to edge, ensuring every strand gets consistent heat and tension—even on the thickest, most stubborn hair.
11 temp settings with memory function from 250°F to 455°F, you’re in full control of your style.
The digital display shows your precise temperature, and the 90W heating system reaches your selected heat in about 20 seconds.
For thick, coarse hair, the high-heat option keeps your style long-lasting.
Travel Ready
Dual voltage (100-240V) means this straightener works in any country.
The 360° swivel cord keeps your workspace tangle-free, and the auto shut-off feature gives you peace of mind.
A heat-resistant pouch and styling glove are included, so you're ready to go from day one.
Does this flat iron work on thick, curly, or coarse hair?
Yes—it's built for it. The 1.75-inch wide, 4.7-inch extra-long plate covers more hair per pass, and 11 heat settings up to 455°F handle even the thickest, coarsest textures with fewer passes and less heat exposure.
What temperature should I use for my hair type?
Fine or color-treated hair: 250–350°F. Normal hair: 350–370°F. Thick or coarse hair: 380–430°F. Very coarse or tightly coiled: 430–455°F. Start low and go up if needed. The 11 digital settings give you way finer control than typical 3–5 heat options.
Does this flat iron damage hair?
Less than most. 3D floating plates prevent snagging, smart sensors keep heat steady with no hot spots, and argan oil plus keratin infused plates condition hair with every pass. Always use a heat protectant for best results.
Can I curl my hair with this flat iron?
Yes. The 4.7-inch extra-long plate lets you curl wider sections in one pass for more natural-looking waves. Rounded edges and smooth ceramic glide make it easy—just twist your wrist. Great for beach waves, loose curls, or flipped ends.
What makes this different from a regular flat iron?
Three things: the 4.7-inch plate is 30% longer than standard, so you finish faster. 80 million negative ions seal the cuticle—no frizz, just shine. And 455°F max heat handles stubborn, coarse hair that lower-temp irons can't straighten.
Which Terviiix hair iron is right for you?
 ONYX GLEAM |  Golden Standard Styler |  Golden Vivid Styler |  Mini GoGo |  Mini GoGo |  Slim Thermal Brush | |
|---|---|---|---|---|---|---|
Customer Reviews | — | — | — | — | — | — |
Price | — | — | — | — | — | — |
Plate/Barrel Size | 4.7" extra-long, curl-friendly | Standard, lightweight | Standard, lightweight | Mini slim plate, for bangs | Mini slim plate, for bangs | 3/4 inch |
Negative Ions | 80M ions, zero-frizz shine | Ceramic heat, smooth results | Ceramic heat, smooth results | Ceramic | Ceramic | Ceramic |
Temperature Control | 11 Settings, 250–455°F | 5 Settings, 320–450°F | 5 Settings, 320–450°F | 430°F | 430°F | 390°F/410°F/430°F |
Best For | All Hair, Full-size Power | All Hair, Lightweight Daily | All Hair, Lightweight Daily | Short hair, bangs, on-the-go | Men's hair, bangs, on-the-go | Root lift, Flips, Pixies, Bobs |
Dual Voltage | ? | ? | ? | ? | ? | ? |
Auto Shut Off | ? | ? | ? | ? | ? | ? |
Swivel Cord | ? | ? | ? | ? | ? | ? |
3D Floating Plates | ? | ? | ? | ? | ? | ? |
Included Accessories | Glove + silicone wrap mat | Glove + nylon pouch | Glove + nylon pouch | Travel pouch | Travel pouch | Travel pouch/Clean Brush |
Dream Stylers Come True
Born from one belief: "Thick hair deserves better tools, not more compromises."
We Started With a Frustration
For years, women with thick, coarse, and textured hair have been forced to use styling tools designed for someone else. Narrow plates that take forever. Short plates that miss half the strand. Gaps that leave uneven results.
Terviiix was founded with a single mission: engineer professional styling tools purpose-built for thick and textured hair — from the ground up.
Why "One Size Fits All" Doesn't Work?
TOO NARROW, TOO SHORT — Standard plates (1" x 3.5") force you to take tiny sections, turning a 20-minute job into an hour.
PLATES THAT DON'T FULLY CLOSE — Many wide-plate irons leave gaps between the plates, causing uneven heat and missed strands.
HEAT WITHOUT CARE — High temperatures without moisture protection leave hair dry, brittle, and damaged over time.
ARM FATIGUE IS REAL — Repeated passes on thick hair means sore arms and wasted time, every single wash day.
Designed for Your Hair Type
Whether you're rocking natural curls, protective styles, or going for a sleek straight look — the ONYX GLEAM handles it all.
The wide plates and high heat are specifically engineered for thick, coarse, and textured hair that other flat irons struggle with.
Perfect for: Type 3A-4C hair, natural hair, thick hair, coarse textures, and anyone who wants salon results at home.
Engineered Different — On Purpose
EXTRA-LONG 4.7" PLATES — 30% longer than standard irons. Grab more hairfrom root to tip in every pass. Less time, less fatigue.
ZERO-GAP — Precision 3D floating plates achieve 100% plate-to-plate contact- no gaps, no missed strands, nouneven heat.
ARGAN OIL & KERATIN INFUSION — Nutrients baked into the ceramic surface activatewith heat to seal cuticles, delivering salon-grade silkpress results at home.
8M NEGATIVE ION GENERATOR — Neutralizes static and frizz at the molecular level fora smooth, glass-like finish.
TERVIIIX ONYX GLEAM
Hair Tools
Dream Stylers Come True
Born from one belief: "Thick hair deserves better tools, not more compromises."
We Started With a Frustration
For years, women with thick, coarse, and textured hair have been forced to use styling tools designed for someone else. Narrow plates that take forever. Short plates that miss half the strand. Gaps that leave uneven results.
Terviiix was founded with a single mission: engineer professional styling tools purpose-built for thick and textured hair — from the ground up.
Why "One Size Fits All" Doesn't Work?
TOO NARROW, TOO SHORT — Standard plates (1" x 3.5") force you to take tiny sections, turning a 20-minute job into an hour.
PLATES THAT DON'T FULLY CLOSE — Many wide-plate irons leave gaps between the plates, causing uneven heat and missed strands.
HEAT WITHOUT CARE — High temperatures without moisture protection leave hair dry, brittle, and damaged over time.
ARM FATIGUE IS REAL — Repeated passes on thick hair means sore arms and wasted time, every single wash day.
Designed for Your Hair Type
Whether you're rocking natural curls, protective styles, or going for a sleek straight look — the ONYX GLEAM handles it all.
The wide plates and high heat are specifically engineered for thick, coarse, and textured hair that other flat irons struggle with.
Perfect for: Type 3A-4C hair, natural hair, thick hair, coarse textures, and anyone who wants salon results at home.
Engineered Different — On Purpose
EXTRA-LONG 4.7" PLATES — 30% longer than standard irons. Grab more hairfrom root to tip in every pass. Less time, less fatigue.
ZERO-GAP — Precision 3D floating plates achieve 100% plate-to-plate contact- no gaps, no missed strands, nouneven heat.
ARGAN OIL & KERATIN INFUSION — Nutrients baked into the ceramic surface activatewith heat to seal cuticles, delivering salon-grade silkpress results at home.
8M NEGATIVE ION GENERATOR — Neutralizes static and frizz at the molecular level fora smooth, glass-like finish.
TERVIIIX ONYX GLEAM
Hair Tools
ONYX GLEAM by Terviiix — Salon Performance, At Home
Terviiix Onyx Gleam Hair Straightener
Engineered for thick, coarse, and curly hair with professional-grade technology.
30% Longer Ceramic Plates
For quick styling & less damage.
Video credit by _therealcoko
From Frizz to Fabulous
Glide smoothly trough hair and leaving it silky & frizz free.
Video credit by itssaleida_
What Makes It Different?
4.7" Extra-Long Plate
80 Million Negative Ions
3D Floating Plates
Full Plate-to-Plate Contact
Our extended 4.7-inch plates (30% longer than standard irons) allow you to grab wider sections of hair from root to tip in one go. Cover more hair in one pass.
Argan Oil & Keratin infused ceramic plates glide smoothly to condition hair. 80 million negative ions seal the hair cuticle, lock in moisture, and deliver smooth, frizz-free shine that lasts all day.
Auto-adjusts to hair thickness for even heat distribution. No hot spots. No pulling. Just smooth, consistent results from root to tip.
Our precision-engineered 3D floating plates deliver full plate-to-plate contact from edge to edge, ensuring every strand gets consistent heat and tension—even on the thickest, most stubborn hair.
11 temp settings with memory function from 250°F to 455°F, you’re in full control of your style.
The digital display shows your precise temperature, and the 90W heating system reaches your selected heat in about 20 seconds.
For thick, coarse hair, the high-heat option keeps your style long-lasting.
Travel Ready
Still Hot? Still Ready to Pack.
The included silicone heat mat wraps right around the plates — store it the second you're done. Zero cool-down time. Zero hassle.
Dual voltage (100-240V) means this straightener works in any country.
The 360° swivel cord keeps your workspace tangle-free, and the auto shut-off feature gives you peace of mind.
A heat-resistant pouch and styling glove are included, so you're ready to go from day one.
Does this flat iron work on thick, curly, or coarse hair?
Yes—it's built for it. The 1.75-inch wide, 4.7-inch extra-long plate covers more hair per pass, and 11 heat settings up to 455°F handle even the thickest, coarsest textures with fewer passes and less heat exposure.
What temperature should I use for my hair type?
Fine or color-treated hair: 250–350°F. Normal hair: 350–370°F. Thick or coarse hair: 380–430°F. Very coarse or tightly coiled: 430–455°F. Start low and go up if needed. The 11 digital settings give you way finer control than typical 3–5 heat options.
Does this flat iron damage hair?
Less than most. 3D floating plates prevent snagging, smart sensors keep heat steady with no hot spots, and argan oil plus keratin infused plates condition hair with every pass. Always use a heat protectant for best results.
Can I curl my hair with this flat iron?
Yes. The 4.7-inch extra-long plate lets you curl wider sections in one pass for more natural-looking waves. Rounded edges and smooth ceramic glide make it easy—just twist your wrist. Great for beach waves, loose curls, or flipped ends.
What makes this different from a regular flat iron?
Three things: the 4.7-inch plate is 30% longer than standard, so you finish faster. 80 million negative ions seal the cuticle—no frizz, just shine. And 455°F max heat handles stubborn, coarse hair that lower-temp irons can't straighten.
Which Terviiix hair iron is right for you?
ONYX GLEAM | Golden Standard Styler | Golden Vivid Styler | Mini GoGo | Mini GoGo | Slim Thermal Brush |
|---|---|---|---|---|---|
| Customer Reviews | |||||
| — | — | — | — | — | — |
| Price | |||||
| — | — | — | — | — | — |
| Plate/Barrel Size | |||||
| 4.7" extra-long, curl-friendly | Standard, lightweight | Standard, lightweight | Mini slim plate, for bangs | Mini slim plate, for bangs | 3/4 inch |
| Negative Ions | |||||
| 80M ions, zero-frizz shine | Ceramic heat, smooth results | Ceramic heat, smooth results | Ceramic | Ceramic | Ceramic |
| Temperature Control | |||||
| 11 Settings, 250–455°F | 5 Settings, 320–450°F | 5 Settings, 320–450°F | 430°F | 430°F | 390°F/410°F/430°F |
| Best For | |||||
| All Hair, Full-size Power | All Hair, Lightweight Daily | All Hair, Lightweight Daily | Short hair, bangs, on-the-go | Men's hair, bangs, on-the-go | Root lift, Flips, Pixies, Bobs |
| Dual Voltage | |||||
| ? | ? | ? | ? | ? | ? |
| Auto Shut Off | |||||
| ? | ? | ? | ? | ? | ? |
| Swivel Cord | |||||
| ? | ? | ? | ? | ? | ? |
| 3D Floating Plates | |||||
| ? | ? | ? | ? | ? | ? |
| Included Accessories | |||||
| Glove + silicone wrap mat | Glove + nylon pouch | Glove + nylon pouch | Travel pouch | Travel pouch | Travel pouch/Clean Brush |