Gemstones

Gem encyclopaedia - GIA

Quick Diamond Search - Rapaport Trade

Guides - Rapaport Trade

Diamond - Wikipedia

GemCad - Blogspot

AFLOW - Encyclopedia of crystallographic prototypes
Diamond
Moissanite

GIA - report check

IGI - report check

HRD - Diamond grading report

GIS - Diamond reports

GSI - report check 

SCS Global Services - Sustainability report 

GRA - several sites. Scan the card and enter the report number

Gem Cad

Gem Ray 

Gem Cut Studio

3D converter - FurniMesh

GrabCad

SketchFab

GCTrader

MakerWorld

3D converter - FurniMesh

FacetDiagrams

FacetFinder

The Gemology Project - faceting diagram database

RSA Gems - Facet design archives

https://offthedop.shop/ - shop with mid designs