It is in between fine (pure gold and diamonds) and imitation jewellery (mainly made of Zinc & Nickel).
Demi-fine jewellery sits between fine jewellery and fashion jewellery — both in quality and price.
Fine jewellery stays the same for years while imitation is tarnished in a few uses.
Demi fine jewellery is made of sterling silver, Stainless Steel and premium alloys as the base metal. We quote it with a high plating technology. Hence, this jewellery takes excessively long time to tarnish.

The jewellery will not tarnish if you use it properly and follow the care instructions. 

The brightness of the gold finish on gold plated jewelery depends on a number of factors like usage, weather conditions (humid weather dulls gold finish faster) and appropriate storage.
We provide up to 1 year guarantee for the gold plating on the jewellery.
We advise you to use gold-dipped pieces occasionally and completely dry them of sweat /moisture along with storage in air-tight plastic covers.
We gold plate our jewellery with 18-carat gold which gives it a real gold look.
We do not use lacquer or other harmful chemicals.

It varies from product to product. Most gemstone products have natural semi-precious stones, but you can go through the description of the product to verify the quality of the stones used in that specific product. We also use synthetic gemstones in various colours.
Wherever a synthetic stone is used, it is clearly mentioned in the product description. Please read the product description for all details.