There is 1 shop in Madrid & 1 in Bacelona. Each purchase over 5,000 euro detax 15.7%. Global cash refund at airport. I bought a 28 ultra violet jypsiere & a silk cashmere scarf at Madrid this Feb. After detaxed jypsiere is approx. HKD49,000 & 7,000+ for the scarf. Also a wide ceramic bangle at approx. HKD7,000+.
At Barcelona I bought a silk/leather handbag(dun know the name) at approximate HKD 10,000+.
At that time Euro rate is 10.5 but now should be lower.
Both shops have limited choices. No b or k, others depends on your luck.