A recent study by the Luxury Institute, conducted on 500 subjects with a net worth averaging $15.1 million, ranks the top 10 most luxurious jewelry houses. Mostly based on quality, uniqueness, exclusivity, social status and customer service.
So here is the list starting with n# 10.
10. MIKIMOTO
Known for its fine cultured pearls and the miss universe crown.
(Japan)
9. BULGARI
With prices $200-$38,000, recording $47 million in profit loss.
(Italy)
8. CHOPARD
Known for its loose diamonds unfettered by metal, thus the Happy Diamonds name.
(Switzerland)
7. CARTIER
Known for serving royalty, after creating a diamond necklace for the Maharajah in 1904.
France
6. PIAGET
Comes in at n 6 with a $3.5 watch launched last year.
(Switzerland)
5. TIFFANY & CO
Strongly associated with its Tiffany Blue trademark.
(United States)
4. GRAFF
Famous for its 2009 £40 million jewellery robbery.
United Kingdom
3. VAN CLEEF & ARPELS
Known as jeweler of the stars and lately for an 80 piece collection.
(France)
2. BUCCELLATI
Known for customizing pieces and excelling in luxury & exclusivity.
(Italy)
1. HARRY WINSTON
With an opening price at $3.700 for a small pair of diamond earrings up to multimillions.
(United States)
LUSTRASS 
That top ten is almost perfect the only missing brand is PATEK PHILIPPPE…the MIKIMOTO [RING],CARTIER [RING],BULGARI [RING],PIAGET [WATCH],AND BUCCELATI & HARRY WINSTON [NECKLACES] ARE BEAUTIFULLY, PERFECTLY ELEGANT.