gem

[1]	gemstone , treasure , jewel , stone , precious/semiprecious stone
[2]	ideal , gemstone , stone , quintessence , perfect example , pearl (of great price) , marvel , flower , elite , cream , creme de la creme , pick , nonpareil , treasure , prize , masterpiece , chef-d'oeuvre
[3]	jewel
[4]	muffin
[5]	jewel , precious stone