Simply put, a not-so-clever scam
Nothing but a scam. They will send you an email such as
"I came across your Instagram - and love your content. I would love to do a long term collaboration with you throughout 2021."
First of all, they obviously have never seen the Instagram of the person they are contacting. Based on a thread on Reddit, they have even contacted people with 2 followers and zero content related to fashion or jewelry. I don't know where they get people's emails, but it seems like they will contact anyone. In a real collaboration, the company is definitely interested in your amount of followers, engament rate, etc.
Their own Instagram page is full of photos stolen from random people and it's clear that the engagement on their posts is not authentic. Keep in mind that nowadays anyone can buy followers, likes and comments. Seems like this is exactly what they have done.
It's a dropshipping business, basically they sell $3 Aliexpress junk jewelry for $75. If you agree to promote their crap, you don't even get it for free yourself, you only get a discount (again, a sign that it is not a collaboration with a legitimate brand).
I actually responded to their first email, saying that I'm not interested in taking part of their scam. They still keep sending me emails, just the person sending them is different.
Do not purchase anything from them. They should be ashamed of their "business".
September 1, 2021
Unprompted review