Opera House Diamond and Gem Trading Quarter

Step off at Charni Road or walk up from the north end of Marine Drive and the Opera House junction looks like any other stretch of old south Mumbai: a knot of traffic, a handful of tall, plain office towers, tea-runners threading between parked cars with trays of cutting glasses.

• Nothing at street level announces that the buildings around you have for decades handled a significant share of the world's cut and polished diamonds, or that the trading chambers here are known by name in Antwerp, Tel Aviv and New York.
• The quarter borrows its name from the Royal Opera House, the restored early twentieth-century theatre a few steps away, but its real business happens upstairs, behind unmarked doors, in small rooms where stones are tipped onto white paper and read under steady north light.
• India's modern diamond trade grew up here rather than in any purpose-built district.
• From the middle of the twentieth century, Gujarati merchant families — many of them Palanpuri Jains, later joined by traders from Kathiawar and Saurashtra — built an export business on rough stones cut and polished in Surat and Bhavnagar and sold on from Mumbai.
• Trust, long credit chains and family partnership did the work that contracts and warehouses do elsewhere, and a handshake in one of these corridors could move a parcel worth more than the building it stood in.
• Since the Bharat Diamond Bourse opened in Bandra Kurla Complex in 2010, much of the formal trade has shifted north, yet Opera House never emptied: brokers, grading and certification labs, angadia couriers and small jewellery workshops still keep the lanes busy on weekday mornings. Understand what you are visiting.
• This is a working trade quarter, not a bazaar, and the chambers are closed to the public — there is nothing to buy, browse or book here, and no reason to follow anyone who suggests otherwise.
• What you can do is walk it.
• The ten minutes between Charni Road station and the junction pass Art Deco apartment blocks, old Girgaum housing, chawl gateways and the theatre façade itself, and the street-level texture — the couriers, the security men, the doorway conversations cut short — explains the business better than any display case could.
• Treat the offices and the people in them as private: ask before photographing anyone, and keep cameras pointed at buildings rather than doorways.
• Girgaum and Thakurdwar, immediately behind the junction, are among the better corners of the city for vegetarian eating, though you should still check before you order.
• The lanes hold small Gujarati, Marwari and Maharashtrian snack houses, farsan and mithai counters, and udupi-style coffee rooms doing idli, dosa and filter coffee; many run vegetarian-only kitchens, but boards and owners change, so read the board and confirm at the counter before you sit down.
• A few minutes' walk west, the stalls at Girgaum Chowpatty are best known for bhelpuri, sevpuri, pav bhaji and kulfi — Mumbai is also a major seafood city, so on any mixed stretch look for a clearly marked pure-veg board rather than assuming.
• Travellers who avoid onion and garlic will find Jain-friendly farsan and thali options in this neighbourhood, but ask for them specifically rather than expecting them by default.