Hello Doc Dan,
I owe you some pics per your request.
The early morning June gloom of SoCal does not bring out the best color and brilliance of these SFSW examples. The Deacon has better photos on his site of a wider array than the few below.
I've arranged these chronologically, as seen with steel types. Santa Fe Stone Works has always maintained a superlative level of craftsmanship, nay, artistry.
CoPilot C09S, GIN-1, 1995:
(y'all know the G-2 "good stuff" history)
Dragonfly with a couple of Yin Yang Crickets:
Dragonfly, C28S ATS-55:
(Spydie hx recap: ATS 55 used only by Spyderco, first seen on Wayne Goddard C16. Dfly Boye dent intro 2004, bug-on-blade intro 2006, last Dfly ATS55 run 2007)
With materials such as these, a single photo doesn't show the varying color, brilliance, chatoyance etc seen in the hand. Sorry I don't have time to make a small gif to illustrate that for you. (and needs sun!)
Yin Yang Crickets, VG10, late 2000s:
(The first C29YY had smaller diameter circles, IIRC. At some point I seem to recall taking a picture illustrating that, but the cerebral crypts grow murky.)
Kiwi, C75 VG10, mid 2000s, appreciate while listening to Holst (or opening a pkg with recording of same):
This motif was crafted for a variety of Spyderco models; maybe a group pic some day..
Whichever materials suit your fancy, don't forget appropriate care and maintenance. For example, some minerals benefit from periodic application of mineral oil to avoid cracking, checking, shrinkage etc.