Platinum #3776 Fountain Pen - Black Diamond (Rhodium Trim)

Midnight smoke, mirror-bright trim, and that famously dependable Platinum heart. Black Diamond is the #3776 Century dressed in translucent charcoal—just enough transparency to glimpse your ink level and the inner workings, without losing the pen’s sleek, formal vibe. It’s the “black tie but breathable” version of a modern classic.

Why we love it at Bottle & Plume

• Smoke with purpose: The subtly translucent body looks luxe on the desk and lets you keep an eye on your ink. Practical meets elegant.

• Rhodium everywhere: Cool-toned rhodium trim and a rhodium-plated 14k gold nib for that clean, contemporary look—no brassiness, just crisp silver sheen.

• Starts every time: Platinum’s Slip & Seal inner cap is the real hero here, keeping the nib happy between sessions so your first line is confident, not crusty.

• Comfort that disappears: Light, balanced, and shaped for long pages. Post if you like; it won’t fatigue your hand.

Nib options (choose your line personality)

• UEF / EF / F – Precise, tidy, and planner-friendly; perfect for small grids and marginalia.

• M – The everyday sweet spot: smooth, legible, and paper-agnostic.

• B / C (Broad/Coarse) – Juicy lines that make shading and sheening inks sing.

• Music – Bold, wet, and expressive for headings, lyrics, or dramatic journal titles.

Highlights

• 14k gold nib (rhodium-plated) made in Japan

• Slip & Seal cap mechanism to help prevent dry-out

• Translucent “Black Diamond” resin with rhodium trim

• Classic cigar silhouette; threaded cap; posts securely

• Fills with Platinum cartridges or the included Platinum converter

Bottle + Plume notes

Black Diamond is that rare combo of understated and interesting. It elevates monochrome inks, flatters blue-blacks, and gives shimmering greys a smoky stage. If you’re building a tight, intentional kit, this is the cool-toned counterpart to the classic black-and-gold—same reliability, different mood.

Ink pairings we love: graphite-leaning blue-blacks, storm-cloud greys, or a subtle teal with sheen. Add a smooth, fountain-pen-friendly notebook and enjoy the hush of a pen that looks sharp and simply behaves.