Antique 20S or 30s Speckled Art Glass Beads Necklace from Czechoslovakia

This is a vintage 20s or 30s Czech necklace with 11mm to 12mm amber colored glass beads with white and light blue splotches on them. They could be also called speckled or mottled. There are light blue 3mm beads dividing the larger beads. The necklace is 21" long and is in excellent condition. Marked Sterling on spring ring clasp, These beads were really hard to find on line, I found Japanese, Venetian, Millefiori, lampwork, and Czech beads that were similar but nothing exactly them same. The other necklace that I saw that was closest was Czech.