Bulgari B.zero1 Ring (4-band, gold)

A ring shaped like an amphitheater

Bulgari introduced the B.zero1 ring in 1999. At a time when most rings were thin bands meant to hold a diamond or colored stone, B.zero1 made the band itself the subject: a thick spiral of gold whose stacked tiers echo the Colosseum, Rome's great amphitheater.

The name is a statement of intent. "B" stands for Bulgari; "zero1" has been explained as a fresh start, a new beginning for a new millennium. The ring was designed to be worn every day rather than kept in a vault for special occasions.

The idea worked because it was technical as much as visual. B.zero1 is built on Tubogas, a technique in which ribbons of gold are wound into a spiral around a hollow, cylindrical core without soldering. The spiral stays flexible and strong, and it is capped at each edge by flat rings engraved with the brand's double "Bulgari Bulgari" signature.

The Roman house behind it

Bulgari was founded in Rome in 1884 by Sotirios Voulgaris, a Greek silversmith from Paramythia in Epirus whose family had moved to Rome in 1881. His first shop was on Via Sistina; the flagship on Via Condotti opened in 1905. In 1934 the company put its name over the door in the classical Latin style, BVLGARI, with a V in place of the U.

By the 1950s Rome was known as Hollywood on the Tiber, and Bulgari's clients included Elizabeth Taylor, Anna Magnani and Ingrid Bergman. The coiled Tubogas technique that B.zero1 is built on was a Bulgari signature in its own right, used in pieces such as the house's Tubogas chokers of the 1980s.

In 2011 LVMH bought Bulgari in an all-share deal valued at about €4.3 billion ($6.0 billion), leaving the Bulgari family as the luxury group's second-largest family shareholder.

1999: designing for the millennium

B.zero1 arrived in a year preoccupied with endings and beginnings. The euro was established on January 1, 1999, concern grew over the Year 2000 computer problem, and the year closed with worldwide celebrations marking the start of 2000.

It was also a year of conflict: NATO began air strikes against Yugoslavia on March 24, and Portugal handed Macau to China on December 20 after 442 years. A ring named for a new beginning fit the mood.

Twenty-five years of reinventions

Through the 2000s the spiral spread to pendants, earrings and bracelets. In 2010, for the ring's tenth anniversary, the sculptor Anish Kapoor reinterpreted it with a mirror-like surface. Later versions used colored marble, black and white ceramic, and pavé diamonds; one, the B.zero1 Perfect Mistake, was built from a so-called error and combines three shades of gold in one ring.

In 2017 Bulgari released B.zero1 Design Legend by the late architect Zaha Hadid, whose wave-like lines between the ring's two outer bands were meant to make the metal seem to hover over the finger rather than close around it.

For the 20th anniversary in February 2019, Bulgari reissued the original five-band ring, the boldest version, in white, yellow and, for the first time, rose gold, plus a pavé diamond version, each engraved "XX Anniversary" inside. The campaign starred Bella Hadid and was shot by Mario Sorrenti. By then, Bulgari had sold more than 2 million B.zero1 rings worldwide.

In 2020 came B.zero1 Rock, with studded edges, diamond accents and ceramic inserts inspired by Bulgari's Tubogas chokers of the 1980s, and in 2021 it expanded to a white gold necklace set with more than seven carats of diamonds.

The four-band ring, and how to read it

B.zero1 rings come in versions with different numbers of spiral bands, from the four-band ring to the bold five-band original reissued in 2019. The FLOAT 100 entry is the four-band ring in 18k white gold, reference AN191026, with no stones. Bulgari describes it as channeling the timeless aesthetics of Roman architecture and lists it at $3,900 as of October 2026.

A genuine ring shows the defining details: a continuous spiral with a hollow core, flexible to the touch, and flat rings at top and bottom engraved with the Bulgari logo. The 20th-anniversary five-band rings carry an "XX Anniversary" engraving inside, which sets them apart from regular production.

A modern classic with no stone

B.zero1 showed that a jewelry icon did not need a gemstone. Its appeal is in the form, the technique and the instantly readable logo, and more than 2 million of the rings had been sold by 2019.

It also gave Bulgari a platform for collaboration with artists and architects, from Anish Kapoor to Zaha Hadid, while the plain gold four-band ring remains in the maker's line, described as "a true icon since 1999."

The numbers

Reference

AN191026

Metal

18k white gold

Bands

Four spiral bands

Carat weight

None; no gemstones on this model

Construction

Tubogas spiral with hollow core, no soldering, logo-engraved edge rings

Production

Collection introduced 1999; more than 2 million B.zero1 rings sold by 2019

Timeline

1. 1884

   Sotirios Voulgaris founds Bulgari in Rome.

2. 1905

   The Via Condotti flagship opens.

3. 1934

   The BVLGARI name, with a classical V, appears over the Via Condotti door.

4. 1999

   Bulgari launches the B.zero1 ring, inspired by the Colosseum and built on the Tubogas technique.

5. 2010

   Anish Kapoor creates a mirror-finish edition for the ring's tenth anniversary.

6. 2011

   LVMH acquires Bulgari for about €4.3 billion ($6.0 billion).

7. 2017

   B.zero1 Design Legend by Zaha Hadid is released.

8. Feb 2019

   The 20th anniversary: the original five-band ring is reissued with "XX Anniversary" engravings; more than 2 million rings sold.

9. 2020

   B.zero1 Rock adds studs, diamond accents and ceramic inserts.

10. 2021

    B.zero1 Rock expands, including a white gold necklace with more than seven carats of diamonds.

11. Oct 2026

    The four-band white gold ring AN191026 lists at $3,900 from the maker.

The world in 1999

• Jan 1, 1999

  The euro is established and the European Central Bank assumes full powers.

• Mar 24, 1999

  NATO begins air strikes against Yugoslavia over Kosovo.

• Apr 20, 1999

  A mass shooting at Columbine High School in Colorado kills 13 students and a teacher.

• Dec 20, 1999

  Portugal hands Macau to China after 442 years of rule.

• Dec 31, 1999

  Boris Yeltsin resigns, leaving Vladimir Putin as acting president of Russia.

• Dec 31, 1999

  Celebrations around the world mark the arrival of the year 2000.

Price record

This is an asking price, not a sale. It is what a seller wanted on the date shown. Asking prices often sit above what buyers pay, but an ask is not a ceiling: a sale can land on either side of it. It is not a value.

By reference price, Bulgari B.zero1 Ring (4-band, gold) is number 89 of 100 in the jewelry entries of the FLOAT 100. 44 of those 100 rest on a realized sale; the rest carry an asking price or a guide value, and each page says which. Rank within the FLOAT 100 itself (65 here) is editorial: how much an object defines its field, not price alone.

Did you know

• The B.zero1 spiral is made without soldering: gold ribbons are wound around a hollow core.
• The ring's shape is modeled on the tiers of the Colosseum.
• One version, the Perfect Mistake, came out of a so-called error and uses three shades of gold.
• Bulgari spells its name with a V in place of the U, a nod to ancient Rome adopted in 1934.
• More than 2 million B.zero1 rings had been sold by the design's 20th birthday.
• Architect Zaha Hadid's version was designed to look as if it hovers over the finger.