SOSNA Exchange Selection · Premium Tier
Investment-grade gemstones curated to the highest standard
Top-tier labs only — GIA, SSEF, Gübelin, GRS, AGL, LOTUS, GCAL, AIGS, GIT. Untreated or minimally treated. From $2,000. Every piece reviewed by SOSNA Trade Desk.
Labs
GIA · SSEF · Gübelin · GRS · AGL · LOTUS · GCAL · AIGS · GIT
Treatment
Untreated or minimal
Price tier
≥ $2,000 USD
Curated by
SOSNA Trade Desk
Premium Tier categories
Select the category you follow
Each category lists only pieces that passed the strict Premium gate.
Current selection
Premium Tier — current availability
Why these categories
What makes a stone a Premium Tier candidate
Each category has its own definition of "top". Below is a short curatorial reference.