I found this jewelry maker on DevianArt/Etsy who makes necklace charms of Tegus! And other reptiles and creatures not usually found accessorized.
Here is her DeviantArt of the Tegu charm
And her page has several other reptile charms photographed.
Her etsy has some offered for sale; I contacted her about the Tegu charm and she said she would make one that looked like him =D