Paying attention to her jewellery likes and dislikes is the legal first big step towards finding her the good engagement ring: 

What metal color will your fiancé wear now? A good amount of women have a definite preference. If she loves white gold or platinum, do not even look at  a diamond or other stone mounted in a yellow gold ring setting. Find out more about vintage engagement rings here

What design of jewelry will she wear now? Is it modern-looking, with bold styling? Will she prefer traditional looking rings? Or would you say [that the] jewellery she wears is classic, resembling those timeless pieces which never go out of style? 

The best indication of her tastes is the jewellery she wears  most often, not things she solely wears sometimes, for the reason that it’s the full-timers that she’s most comfortable with. 

Has She Hinted at her Likes and Dislikes? Has she ever mentioned her favorite jewelry styles or pointed out engagement rings when you are looking together? If not, take her shopping. It is not troublesome to steer yourselves towards the jewelry stores. If you want to be subtle, say you’re shopping for a new watch, but be sure to pause at the engagement ring counters.

Perhaps she has a friend who recently became engaged. Does she like her friend’s engagement ring? Why or why not? 

Will she favor diamonds? Several women don’t. Sapphires plus rubies are each durable gemstones which are mostly set into engagement rings for women who don’t wish to wear diamonds. 

What Looks Best on Her Hands?

An elongated diamond, such as a marquise or oval, may make short fingers look more sleek–but use cautious to not overdo the look or it can have the other effect.

Wide bands typically make fingers appear even shorter than they are, therefore think proportional:Ladies with long fingers may generally wear daring ring styles. 

A setting that’s very delicate can get lost on large hands, over-emphasizing their size and making the ring look smaller. 

Select the Right Shape & Setting. Spherical diamonds are the number one shape chosen by brides, but perhaps not your bride. She might like an elongated marquise, oval or pear-shaped stone, or a square or emerald cut diamond. Fancier shapes, like hearts, are another option.