I have yet to purchase a piece from Eko, but have adored the place from the first time I walked in.
They carry unique jewellery from several designers (many of which are based out of NYC) using different materials; from leather, wood, gold, silver, beads, gems and of course diamonds. With something for everyone, most pieces are $300+ although they carry a handful or more inexpensive silver charms and bracelets.
You can find semi-precious stones, gems and diamonds with my favourite piece by Mizuki - a stunning 4'' icicle pendant with a price tag of $4,500.00.
I've always found the staff to be courteous and friendly, and I treat the store with respect by eying their pieces but only asking them to pull what I'm more serious about.
Highly recommended for those who want a unique piece less commonplace.