Found this nice gift website which has a section for gifts for children. It is a jewelry website which is quite well organised and if you interested in jewelry, this is the site to go to. Everything is categorised properly such as Diamonds, Gemstones, Rubies, Pearl etc making it easy to find exactly what you want.
This site caught my attention since it has a children section. The gifts in that category is quite good too. Below is an angel pendant that caught my eye.
In short it is one of the better organised online jewelry website which has a suitable section for kids that I've seen so far.
It's definitely a good reward for chess queens who need to be rewarded to further motivate them in their road to improvement for chess. A nice trinket of jewelry which doesn't have to be too expensive is the perfect incentive gift.