Logo Design for a stylish new Jewellery Brand

This is what Seraphiye was looking for in their logo design

We are a new jewellery brand, selling online (yet to launch). The brand is everyday luxury jewellery. Gold, sterling silver and gemstone jewellery for 25-40 year old women who want to self-gift or buy gifts for their girl friends.
Competitors include Astley Clarke, Monica Vinader, Carrie Elizabeth, The White Company, Jo Malone.
We need a business name logo for "SERAPHIYE" for use on the website and on our packaging, that also incorporates an image logo (to use for stickers, stamping where the full business name is not appropriate) - this could be initials or a shape. The origin of the brand name is Greek, so use of the Phi symbol might be nice (but open to other ideas). I have attached an image of the current font in use, and I'm quite happy with it (and the use of upper case), but open to other options.
The final design should be simple and stylish, conveying a sense of luxury.
Core colours are matte navy with silver, so please submit designs with this in mind. Read more