Gemstones
Sapphires, rubies, and emeralds: origin, treatment disclosure, the labs that matter, and what to pay per carat.
Spinel Gemstone: The Collector's Stone That Beats Ruby on Value Per Dollar
A skeptical buyer's guide to the spinel gemstone: per-carat price ranges by color and size, which lab report to demand (GIA, SSEF, GRS, Gübelin, AGL), and how to spot synthetics.
Tanzanite Buying Guide: One Mine, Heated Stones, and What to Pay
A skeptical tanzanite buying guide: why one mine feeds the whole market, why nearly every stone is heated, how to read color, and real per-carat price ranges.
Pearl Buying Guide: Akoya vs Tahitian vs South Sea vs Freshwater (and How to Spot Thin Nacre)
A skeptical pearl buying guide: nacre over name, real price ranges by type, 5 field tests for thin nacre, and an at-the-counter script to verify what you pay for.
Sapphire Buying Guide: Origin, Heat Treatment, and What to Pay Per Carat
A skeptical sapphire buying guide on origin premiums, heat-treatment disclosure, per-carat price ranges by quality, and which gem lab report to actually trust.
Alexandrite Buying Guide: Color Change, Origin, and What You're Actually Paying For
An evidence-based alexandrite buying guide: how to judge color change, what origin really costs, spotting synthetics, per-carat price ranges, and which lab to trust.
Opal Buying Guide: Solid vs Doublet vs Triplet, and the Value Traps to Avoid
An evidence-based opal buying guide: spot doublets and triplets, read play-of-color and body tone, dodge dyed Welo, and use a counter checklist before you pay.
How to Buy a Ruby: Burma vs. Mozambique, Pigeon Blood, and the Glass-Filling Trap
How to buy a ruby without overpaying: treatment vs. origin, Burma vs. Mozambique, pigeon-blood reality, per-carat price ranges, and which labs actually count.
Aquamarine Buying Guide: What Color Saturation Actually Costs
An aquamarine buying guide that prices color saturation: per-carat math, heat vs. Maxixe irradiation, real ranges, and an 8-step checklist for the counter.
Emerald Buying Guide: How to Read Treatment, Origin, and Lab Reports Before You Pay
An evidence-based emerald buying guide covering oil and resin treatment grades, Colombian vs Zambian origin, clarity reality, and which lab reports actually protect your money.
Garnet Gemstone Buying Guide: Tsavorite, Demantoid, Spessartite, and Rhodolite Beyond the January Birthstone
A serious buyer's guide to the garnet gemstone group: tsavorite, demantoid, spessartite, and rhodolite. Real per-carat price ranges, treatment facts, and lab advice.
Gemstone Treatments: Which Ones Buyers Accept and Which Destroy Value
A buyer's guide to gemstone treatments: why heat is accepted, why glass-filling, diffusion, and dye gut resale value, and how to read disclosure on lab reports.
Paraiba Tourmaline: Why Neon Beats Diamond Per Carat (And When You're Overpaying)
Paraiba tourmaline can outprice fine diamond per carat. The copper chemistry, the Brazil-vs-Mozambique naming fight, heat treatment, and which lab to trust on origin.
Gemstone Certification Labs: What SSEF, Gübelin, GRS, and AGL Reports Actually Prove
How the major gemstone certification labs differ — SSEF, Gübelin, GRS, AGL, GIA — and which reports actually justify a colored-stone premium at the counter.
Investing in Colored Gemstones: Gübelin-Certified 2026 Auction Prices
What unheated Burma rubies, Kashmir sapphires, and Colombian emeralds fetched at Sotheby's and Christie's in 2026 — and where new buyers lose money on treatment disclosure.