Insights
20+ species. Treatments, origins, appraisal know-how.
Written for buyers and sellers and vetted by gemologists.
The 20+ species index
Browse every species, or open the Market board for the
Gemius Index and per-carat market band of all 23.
ProfileMineralogy + ScienceArticlesAlexandrite: Emerald by Day, Ruby by NightGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesAmber: Fossilized Resin and Insect InclusionsGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesAmethyst: A Purple Quartz Gemstone GuideGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesAmetrine: A Bicolor Quartz Gemstone GuideGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesAquamarine: A Captivating Blue GemstoneGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesCitrine: A Yellow Quartz Gemstone GuideGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesEmerald: A Captivating Green GemstoneGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesGarnet: A Diverse Group of GemstonesGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesIolite: The Viking Navigation GemGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesJadeite: The Stone of HeavenGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesKunzite: George Kunz's Pink DiscoveryGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesMoonstone: The Floating Light of AdularescenceGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesMorganite: A Pink Beryl Gemstone GuideGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesOpal: A Unique Play of ColourGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesPeridot: The Gem of the SunGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesRuby: King of GemsGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesSapphire: A World of Colour and DurabilityGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesSpinel: The Gemstone Imposter No MoreGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesSunstone: Oregon's Aventurescent FeldsparGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesTanzanite: A Single-Origin DiscoveryGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesTopaz: A Gemstone of Many ColoursGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesTourmaline: A Multicolor Gemstone GuideGemius IndexPrice Index + Market Bands ProfileMineralogy + ScienceArticlesZircon: High-Dispersion Fire of AntiquityGemius IndexPrice Index + Market Bands
| Market band / ct | |||
|---|---|---|---|
| TOUTourmaline | 140.0 | ▲ 7.7% | $2,000 to $20,000 / ct |
| GARGarnet | 128.0 | ▲ 5.8% | $1,000 to $5,000 / ct |
| ALEAlexandrite | 124.0 | ▲ 5.1% | $21,000 to $38,000 / ct |
| SPISpinel | 124.0 | ▲ 5.1% | $6,200 to $12,000 / ct |
| JADJadeite | 122.0 | ▲ 4.7% | $26,000 to $55,000 / ct |
| OPLOpal | 122.0 | ▲ 4.7% | $1,800 to $6,300 / ct |
| SAPSapphire | 122.0 | ▲ 4.7% | $11,000 to $26,000 / ct |
| EMEEmerald | 118.0 | ▲ 4.0% | $13,000 to $26,000 / ct |
| RUBRuby | 118.0 | ▲ 4.0% | $19,000 to $254,000 / ct |
| SUNSunstone | 118.0 | ▲ 4.0% | $500 to $1,500 / ct |
| TNZTanzanite | 118.0 | ▲ 4.0% | $1,000 to $1,600 / ct |
| MNSMoonstone | 114.0 | ▲ 3.2% | $310 to $410 / ct |
| AMBAmber | 110.0 | ▲ 2.3% | $7 to $9 / ct |
| ZIRZircon | 110.0 | ▲ 2.3% | $210 to $340 / ct |
| KUNKunzite | 109.0 | ▲ 2.2% | $100 to $140 / ct |
| TOPTopaz | 109.0 | ▲ 2.2% | $820 to $1,200 / ct |
| AQUAquamarine | 108.0 | ▲ 1.9% | $910 to $1,500 / ct |
| PERPeridot | 108.0 | ▲ 1.9% | $190 to $300 / ct |
| AMEAmethyst | 107.0 | ▲ 1.7% | $50 to $70 / ct |
| MORMorganite | 107.0 | ▲ 1.7% | $310 to $420 / ct |
| CITCitrine | 106.0 | ▲ 1.4% | $15 to $20 / ct |
| IOLIolite | 106.0 | ▲ 1.4% | $50 to $80 / ct |
| AMTAmetrine | 104.0 | ▲ 1.0% | $40 to $50 / ct |