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TCW, Metal Gram & Value Estimator

Chain Length, Millimeter Width, Carat Weight (TCW) & Metal Gram Estimator

Estimates for planning a purchase. Every stone origin and metal purity is named per the FTC Jewelry Guides (16 CFR Part 23).

1. Your Piece

Your Piece

Tennis Chain · 20" · 4mm

925 Sterling Silver (Rhodium-Plated) · VVS D-Color GRA Moissanite

30.25 ct TCW
Est. Total Carat Weight
121 stones
Individual Stone Count
23 g
Finished weight in 925 Sterling Silver
29 g
Finished weight in 14k Solid Gold

Neck-Drop & Collar Fit: 20" falls 1–2" below the collarbone on a 15.5"–17" neck — the most popular men's length.

Side-by-Side Fair Retail Valuation

Stone (disclosed origin)Est. Fair RetailThis Piece vs. NaturalStone $/ct vs. Natural
VVS D-Color GRA Moissanite (your pick)$5,00096% less than natural96% less per carat
IGI/GIA CVD Lab-Grown Diamond$19,82083% less than natural83% less per carat
Natural Mined VS Diamond$115,110—0% less per carat
75%–92% savings: IGI/GIA lab-grown diamonds typically cost 75%–92% less than comparable natural mined diamonds, and VVS D-color moissanite costs less still. Moissanite (silicon carbide, RI 2.65, fire dispersion 0.104 vs. diamond's 0.044) passes a standard thermal-conductivity diamond probe; a dual thermal + electrical conductivity tester distinguishes moissanite from diamond — and under FTC 16 CFR Part 23 it must always be sold as moissanite, never as diamond.

Values use approximate retail $/ct (moissanite ~$160, lab-grown ~$650, natural VS ~$3,800) plus metal and labor; actual prices vary by cut, color, clarity and maker.

Matched Picks

Gemstone line necklace (representative photo)Best Value Sparkle★ 4.7
Moissanite Tennis Chain • Amazon

3mm–5mm VVS D-Color GRA-Certified Moissanite Tennis Chain in Solid 925 Sterling Silver / 14k Gold

GRA-certified VVS D-color moissanite (silicon carbide — not diamond) set in 925 sterling silver or 14k gold.

  • StoneGRA moissanite (SiC), VVS D
  • Width3mm–5mm
  • Metal925 sterling / 14k gold
  • FTC DisclosureMoissanite, not diamond
$289 $349
Save $60 via Amazon
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Cut diamond macro close-up (representative photo)Best Lab-Grown Diamond★ 4.8
Lab-Grown Diamond Jewelry • Blue Nile

Blue Nile IGI/GIA-Certified CVD Lab-Grown Diamond Solitaire Pendants, Tennis Bracelets & Rings

IGI/GIA-graded CVD lab-grown diamonds — real diamond chemistry, disclosed as laboratory-grown.

  • StoneLab-grown diamond (CVD)
  • ReportIGI / GIA
  • AOV$1,500–$4,000+
  • NetworkCJ / Impact (3.5%–5%)
$1,950
via Blue Nile
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Jeweler's triplet loupe for gemstone inspection (representative photo)Must-Have Verification Kit★ 4.6
Tester & Cleaner Kit • Amazon

Professional Dual Thermal & Electrical Conductivity Diamond / Moissanite Tester + 45kHz Ultrasonic Jewelry Cleaner Kit

A dual thermal + electrical tester distinguishes moissanite from diamond; the 45kHz ultrasonic tank keeps stones bright.

  • TesterThermal + electrical conductivity
  • Cleaner45kHz ultrasonic
  • DetectsMoissanite vs. diamond
  • NoteNot a grading report
$79 $99
Save $20 via Amazon
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