blue agate, sapphirine mineral gem stone on black nice background, blue chalcedon close up. narrow focus line

mineral geology gem rock stone gemstone jewelry blue texture agate background color natural macro crystal white nature pattern semiprecious structure surface specimen chalcedony lace collection bright material closeup decoration polished adornment ornament tumbled little beauty pebble quartz small jewel ornamental object decorative shiny isolated precious gemmology up close geological