Explore extraordinary rocks, minerals, fossils, rough stone and collector specimens. Learn lapidary, have your own stones professionally cut and polished, identify a mystery find, or simply come discover something you did not know you were looking for.
Shop, learn, create or identify. Pick a path and get where you need to go without digging through a maze of menus.
Minerals, fossils, crystals, rough rock, lapidary material and collector specimens.
Explore the shop →02 / LEARNBeginner-friendly education covering stone, tools, safety, cutting, shaping and polishing.
View classes →03 / CREATEProfessional cutting, polishing, Collector's Finish, cabochons and stone drilling.
See services & pricing →04 / IDENTIFYBring your mystery rock or mineral, photos and location details and we will help guide you.
Get Rock ID help →The Hidden Gem is built around the thrill of discovery. Browse one-of-a-kind minerals, fossils, crystals, lapidary rough and collector pieces, with fresh material arriving as collections, field finds and unusual opportunities come through the door.
Start with the fundamentals of stone, tools, safety and the lapidary process, then progress into guided hands-on cutting, shaping, sanding and polishing.
The same place where you find a stone can help you understand it, work it, recover it or find a new home for a collection.
Rock cutting from $65, polishing from $80, Collector's Finish, cabochons and drilling.
Explore lapidary →Get guidance on a mystery rock or mineral with the piece, good photos and locality details.
Rock ID help →Professional metal detecting for lost rings, jewelry, keys and other important metal items.
Search & recovery →We review select mineral collections, estate material, rough, slabs and interesting rockhound finds.
Sell or trade →Expedition announcements, education, member benefits and a growing collecting community.
Join free →Reserve the shop after normal hours for dedicated, quieter one-on-one shopping time.
Book private shopping →A glimpse at the kind of material that moves through The Hidden Gem, from statement specimens to field rough waiting for the saw.
Part rock shop. Part lapidary studio. Part classroom. Part treasure hunt. The Hidden Gem is for collectors, families, makers, rockhounds and curious first-timers.
The Hidden Gem Rock Shop is located at 2210 Taylor Road, Suite A in Penryn, California, serving collectors, makers, families and rockhounds throughout Placer County and the greater Sacramento region.
We are at 2210 Taylor Road, Suite A, Penryn, CA 95663 in Placer County, convenient to Loomis, Rocklin, Roseville, Auburn and surrounding communities.
Yes. We offer professional rock cutting, flat-face polishing, Collector's Finish, cabochons, stone drilling and select custom lapidary services.
Yes. Our education path begins with Lapidary 101 and progresses into hands-on cutting, shaping, sanding and polishing.
Yes. Bring the actual piece when possible, clear natural-light photos and information about where it was found.
Yes. Private Shopping Experiences can be reserved through Setmore for dedicated shopping time after normal shop hours.
