'Stuart Crystal' Charles I of England Diamond Mounted

'Stuart Crystal' Charles I of England Diamond Mounted Silver and Gold Mourning Slide, mid 17th century
recto with 22 collet set rose cut diamonds around the facetted oval rock crystal glazed portrait miniature after van Dyke, verso with braided gold wire cypher under white enamel bead crown on plaited hairwork ground, in original fitted leather case, case 3.1 x 2.8 in — 8 x 7 cm

Literature:
For more information please visit:
http://www.teachinghistory100.org/objects/about_the_object/memorial_ring_for_charles_i

and

https://thepragmaticcostumer.wordpress.com/2012/07/02/i-need-your-help-making-a-wikipedia-page-for-stuart-crystals/

Estimate: $3,000—5,000