Rustan's Department Store is considered the Philippines most prestigious retailer, carrying many of the world's most famous upscale or luxury brands names, among them, Cartier, Mikimoto, Tiffany, Ermenegildo Zegna, Nina Ricci, Alfred Dunhill, Sonia Rykiel, and Estee Lauder.

Eventually, the Tantocos expanded the business to a small gift shop located along San Marcelino Street, Manila.

[4] By the 1960s, Rustan's successfully introduced several international and haute couture brands to the Philippines for the first time including Yves Saint Laurent and Christian Dior.

By 1970, the flagship store opened in Makati and the building became well-known for its blue external tile work for many decades and was sometimes referred to as the "Jewel box.

Today, this continues with a diversified portfolio of brands within beauty and personal care, apparel, watches, luggage, footwear, accessories, home, and lifestyle products.

[7] In parallel, the Tantoco family's reputation as leading retailers continued to grow as the couple's six children became involved in the daily business.

[15][16] On March 23, 2018, the Dairy Farm Group sold RSI to Robinsons Retail Holdings, Inc. (RRHI) through a stock swap.

After the sale, the Dairy Farm Group owned 18.25% and 1.75% of RRHI (20.00% in total) through Mulgrave Corporation and GCH Investments respectively.