It would appear as though photos by W&D Downey are the "authentic" coronation portraits.

I am still trying to determine QM's jewels.

Obviously she is wearing her, specially made coronation crown (as opposed to Queen Alexandra's as seen in some montages)(or the Delhi Durbar Tiara as some photos denote).

Cullinan IV is mounted on the band with the Koh-i-Nor diamond mounted in the front cross pathee and Cullinan III is mounted in the cross atop the monde.
[Edited per PaulP correction]

I think she is wearing QV's Diamond Stud Earrings.

She seems to be wearing nine rows (yes - 9) of collet diamond necklaces - the last one may be QV's Coronation Necklace as it has the large pendant hanging from it (although it could have been added to a different necklace).

It seems as though she is wearing the full Cockade Brooch (as QA had done) - albeit with the side moved higher towards the center - with what may be QV's Coronation Earrings as pendants on each side.

She is wearing a stomacher - but it is hard to tell from some of the photographs what exactly it is.

In the painted portrait - the stomacher is shown as QV's three Bow Brooches.

However, I think that, looking at other photos, she is in fact wearing her Lovers Knot Brooch and then QV's 3 Bow Brooches.

The painting also shows her wearing her Garter band around her arm - but none of the photographs show the Garter.

On each wrist QM wears one multi-strand diamond (or pearl) bracelets - each with a portrait or plaque of some sort. Maybe the King William and Queen Adelaide Buckles??

She wears the Consort's Coronation Ring on her right ring finger and one or two rings (possibly her wedding rings) on her left ring finger.

Let me know your thoughts as I am just taking my "best guess" based on the available pictures.