Hublot Square Bang Unico 821.NX.0170.RX.0904 Guide

The Hublot Square Bang Unico Titanium Jewellery 821.NX.0170.RX.0904 is a 42 mm titanium watch with a diamond-set bezel, a grey index dial and a black rubber bracelet, the jewellery version of Hublot's square-cased Square Bang Unico line. This guide covers the specifications, how the Square Bang Unico line relates to the round Big Bang Unico, how the titanium case and diamond bezel wear together, how this jewellery reference compares with other Square Bang Unico configurations, price context and what to check before buying. Bizak & Co. sources the 821.NX.0170.RX.0904 to order; the Hublot collection lists the configurations we can seek.

Last reviewed on September 28, 2026 by Filip Biczak. Prices are dated observations, not quotes.

Hublot Square Bang Unico Titanium Jewellery 821.NX.0170.RX.0904 specifications

For background on the Swiss watchmaking standards that inform case construction and testing across the industry, see the Fédération de l'industrie horlogère suisse and the COSC, the Swiss body responsible for official chronometer certification testing.

Where does the Square Bang Unico sit in Hublot's line-up?

Hublot built its modern identity on the round Big Bang case, first shown in 2005, and the Unico name that follows it across several product lines refers to the in-house manufacture movement architecture the brand developed for its chronograph models. The Square Bang Unico takes that same design language, the exposed case screws, the fusion of materials, the layered bezel, and reshapes it into a square case with rounded corners. Not every Square Bang Unico reference carries a chronograph movement; this Titanium Jewellery configuration is fitted with a time-only automatic movement, which keeps the case slimmer and puts the visual focus on the diamond-set bezel rather than on chronograph pushers and sub-dials. Hublot has used the square-case treatment across several materials in the wider Square Bang family, including ceramic and carbon-fibre-composite versions alongside titanium, so the case shape itself is a platform the brand varies by material and finish rather than a one-off design exercise.

How does titanium with a diamond bezel wear on the wrist?

Titanium is markedly lighter than steel at the same volume, which matters more on a square case than a round one because a square shape carries more mass toward the corners and edges than a round case of the same nominal size. The diamond-set bezel adds visual weight and sparkle without adding meaningful physical weight, so the watch reads as a jewellery piece while wearing closer to a sports watch than its appearance suggests. A 42 mm square case sits differently on the wrist than a 42 mm round case; the straight edges and flat sides mean it tends to look and feel larger than the same nominal diameter in a round case, so trying the watch on before buying is worth doing if you have not worn a square-cased watch before. The black rubber bracelet is practical against daily wear and contrasts deliberately with the diamonds and titanium, keeping the overall look from tipping fully into formal jewellery territory. Rubber also copes better than a metal bracelet with the kind of daily contact a case this size inevitably sees, resisting sweat and moisture in a way that suits owners who want to wear a statement piece often rather than reserve it for occasions.

Titanium Jewellery vs other Square Bang Unico configurations

Buyers drawn specifically to the square case but wanting the brand's signature Unico chronograph function should look at non-jewellery Square Bang Unico references with a chronograph layout; buyers who want the round Big Bang silhouette instead should compare directly against the Big Bang Unico line. This titanium jewellery piece is for someone who wants the square case and the diamonds together, ahead of chronograph functionality.

How much is a Hublot Square Bang Unico Titanium Jewellery watch?

• Retail. Hublot does not publish a single fixed U.S. list price for diamond-set Square Bang Unico references beyond what a boutique quotes at the time of order, since stone weight, clarity and setting cost vary between individual pieces even within the same reference number.
• Bizak catalogue ask. On September 28, 2026 our sourced catalogue listed this 821.NX.0170.RX.0904, brand new, at US$61,599, sourced to order.

That figure describes what we saw and will move. Ask for a dated quote confirming the exact stone specification and documentation before you commit.

Is a diamond-set Square Bang Unico a good investment?

Treat it as a piece bought for the design and the stones rather than for resale arithmetic. Jewellery-led watch references generally see thinner secondary-market demand than a brand's core chronograph models, and the value of a diamond-set piece depends heavily on the stones themselves holding their setting and clarity over time. Buy it because the combination of titanium, the square case and the diamond bezel is what you want on your wrist; if resale matters, ask for a written cash-buy assessment before you commit.

Buying a Square Bang Unico Jewellery piece: what to check

• Stone setting. Inspect every diamond in the bezel under strong light for looseness or gaps before accepting delivery; a brand-new piece should show no movement in any stone.
• Case finish. Titanium marks more easily than steel; on a new piece the case surfaces should show no handling marks or scratches at all.
• Bracelet and clasp. Test the rubber bracelet's attachment and the clasp action; it should lock cleanly with the bracelet seating flush against the case.
• Documentation. Confirm full box and papers, with the case serial matching the paperwork exactly.
• Movement function. Wind and set the watch and let it run for a period before purchase to confirm timekeeping looks reasonable, though a full service check is best left to a qualified watchmaker.

Our authentication process describes what we inspect before dispatch.

Quick answers

How much is the Hublot Square Bang Unico Titanium Jewellery 821.NX.0170.RX.0904?

Hublot does not publish a fixed list price for diamond-set pieces, since stone specification varies by example. Bizak's sourced catalogue listed this brand-new 821.NX.0170.RX.0904 at US$61,599 on September 28, 2026, sourced to order.

Does the Square Bang Unico have a chronograph movement?

Not always. This Titanium Jewellery configuration runs a time-only automatic movement; other Square Bang Unico references carry Hublot's in-house Unico chronograph architecture.

How does a 42 mm square case wear compared with a round one?

A square case of the same nominal size tends to wear larger than a round case because straight edges carry more visible mass toward the corners. Try the watch on if you have not worn a square-cased piece before.

Why titanium rather than steel for this case?

Titanium is noticeably lighter than steel at the same volume, which matters more on a square case that carries mass toward its edges. It also keeps the watch light despite the added visual weight of the diamond bezel.

Is a diamond-set Hublot a good investment?

Buy it for the design and the stones rather than to trade. Jewellery-led references generally see thinner secondary-market demand than a brand's core chronograph models, and value depends on the stones' condition over time.

Request a Square Bang Unico 821.NX.0170.RX.0904 sourcing quote

Tell us your preferred condition, whether full documentation is required, and your budget and timing, through our sourcing enquiry form. We confirm the specific watch, photographs and final price before you commit. Catalogue entry: Square Bang Unico Titanium Jewellery; browse the Hublot collection or sell or trade your Hublot.

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