The Seventeen Ruby Arhats
A set of 17 hand‑carved ruby figures representing the Buddha’s disciples (Arhats). Each piece is approximately 220 carats, totaling ~3,740 carats for the complete set. UV (365 nm) response and FT‑IR screening support natural corundum (Al₂O₃) colored by Cr³⁺.
UV Response (365 nm)
Under long‑wave UV (≈365 nm), the ruby exhibits a vivid red luminescence associated with Cr³⁺ activation. This is typical for natural ruby and helps to distinguish it from dye/polymer treatments.
- Source: 365 nm UV (LWUV); optional auxiliary blue illumination
- Feature: Strong red fluorescence with subtle area‑to‑area variations (growth zoning)
- Significance: Unlike uniform fluorescence from dyes, the non‑uniform emission supports natural origin
FT‑IR (Text Summary)
FT‑IR (Fourier‑transform infrared) was used as a screening tool to check for organic fillers/resins and to assess structural consistency. In KIST measurements, no polymer/resin bands were observed in the ~2800–3000 cm⁻¹ (C–H stretch) region and no glass‑filling bands in the ~1000–1100 cm⁻¹ (Si–O) region. The 900–500 cm⁻¹ lattice region is consistent with corundum (Al₂O₃).
- Observation: Absence of C–H stretch and Si–O network bands
- Lattice: Corundum‑typical fingerprint; no anomalous foreign phase detected
- Conclusion: Within FT‑IR limits, no polymer or glass filler indicated — in line with untreated natural ruby
Size (Text Only)
Set composition: 17 pieces • Approx. 220 ct per piece • Total weight ~3,740 ct.
(Detailed individual dimensions/specs available on request.)