They call it the Richie Rich Club, and it is about to get even richer. India's wealthiest will quadruple their net worth in the next four years, a report says, with hundreds of thousands of new entrepreneurs and inheritors becoming multimillionaires.
The survey, based on interviews with 150 ultra-high net worth individuals, comes amid signs of returning business confidence in the world's biggest democracy.
Recent years have seen lacklustre growth, rising prices of basic foodstuffs and a weakening currency. But the Bharatiya Janata party (BJP) won a landslide victory in May on a pledge to reinvigorate the ailing economy.
Despite the slowdown, there are now nearly a sixth more Indians worth in excess of .75m (£2.2m) than just one year ago, the report for the Kotak Mahindra bank notes.
"Cities are mushrooming, the middle class population growing, opportunities have increased manyfold and the political environment has improved greatly in recent months," according to Murali Balaraman, a co-author.
Between them India's rich hold assets worth a trillion dollars, which is around a fifth of the total wealth in the country. Within four years, that total is likely to reach tn (£2.3tn), the report says, making three times as many people multimillionaires.
Serving the new rich – and the old money – is a booming luxury market.
"They really want to show or talk about their wealth in a really subtle way, and consumption of luxury goods is a nice way to do it," Balaraman said.
Abhay Gupta, the CEO of brand consultancy Luxury Connect, said the market for top end goods and experiences would "only get bigger".
"There is a huge aspirational class who look up to what the very wealthy are doing and then copy it," he said.
Cars are among the most popular items bought, the report says. Whereas five years ago locally made SUVs were shown off by the wealthy, now only foreign cars will turn heads. Mercedes saw a 47% surge in sales in India last year. BMW launched a new 0,000 (£117,700) model in Delhi this week.
India's appalling infrastructure restricts demand, however. Lamborghini's chief executive, Stephan Winkelmann, admitted last year that the traffic and roads in India "are not so suitable" for the 0,000 (£265,000) sports cars. In India, Lamborghini sells two models: the Gallardo and the Aventador, which has a top speed of 217mph.
Winkelmann said Lamborghini's Indian customers were much younger than those in Europe, with a typical buyer being in his 30s. However, the most popular investments remain real estate – mainly within India – and jewellery.
India's super-rich have long raised eyebrows around the world with their spectacular spending. Mukesh Ambani, the country's wealthiest man, has built the world's most valuable home in Mumbai, the commercial capital.
The 27-storey tower, complete with helicopter pads, indoor cinemas and a staff of more than 600, is worth an estimated bn (£500m).
The three-day wedding of the niece of Lakshmi Mittal, the UK-based steel tycoon who is worth an estimated bn (£9.4bn), was reported to have cost m (£47m). Hundreds of guests were flown to Barcelona for the ceremony and party, which took place in a museum in the city.
But buyers of luxury goods searching for the psychological satisfaction of exclusivity are becoming increasingly demanding, the Kotak Mahindra report says. One ordered nine cases of Japanese whisky costing over 0 (£440) a bottle for a wedding reception.
The attraction of the imported whisky was that no one who attended the wedding would find out how to source the same drink in India, the report adds.
Another big spender systematically bought identical pairs of Louis Vuitton bags, then cut up half of them to make clothes that would match her accessories.
Even the traditional wedding is evolving fast. Presents such as silver plates, dried fruit or sweets once sent with wedding invitations are being replaced by gifts by top western designer brands.
"These days it's Rolex watches and Louis Vuitton bags," says Gupta.
Almost half new ultra high net worth individuals live in smaller provincial cities.
A high proportion give substantial amounts to charity, though the report notes that the "growth of philanthropic spends in India has not been proportional to overall growth in ultra high net worth individual wealth".
Co-author Balaraman says that growth in the number of rich people would not result in social tensions as a wide gap in incomes and wealth is an "accepted norm" in India.
"People know that someone is rich and someone is poor and they carry on with their lives," he explains.
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