Diamond Foundry logo

Diamond Foundry

San Francisco, California, USA Materials Science & Engineering Private

Diamond Foundry is a producer of lab-grown diamonds and diamond wafers for jewelry, industrial, and semiconductor applications. Founded by solar entrepreneur Martin Roscheisen and Jeremy Scholz, the company uses proprietary reactor technology to produce synthetic diamonds at scale. Diamond Foundry is certified carbon-neutral and has raised $315 million in funding, achieving unicorn status in 2021 with a $1.8 billion valuation. The company operates manufacturing facilities in the United States, Spain, China, and other locations.

Overview

Company data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.

Founded

2012

Employees

183–1,000

Total Funding

$390M

3 rounds

Latest Valuation

$1.8B

April 27, 2021

Funding

Total raised $390M across 3 rounds

Funding data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.

Last updated 06-25-2026

Latest Round

Type

Series D

Date

April 27, 2021

Amount

$200M

Valuation

$1.8B

Lead Investors

Fidelity
DateRoundAmount RaisedValuationLead Investors
April 27, 2021 Series D $200M $1.8B Fidelity
October 1, 2018 Series B $140M $0.66B Not publicly disclosed
November 15, 2015 Series A $50M Angel syndicate

Valuation Trajectory

Valuation indexed to 1.0× at the selected entry round. Valuation marks are estimates and may contain errors. Hover each dot to compare.

If you invested at:
1x 2x 2019 2020 2021 Diamond Foundry

Entry · Series B

$0.7B

Oct 2018

Diamond Foundry today

$1.8B

Apr 2021 · latest mark

Diamond Foundry multiple

2.7x

valuation uplift since first round

Y-axis is logarithmic. Hollow dots = estimated valuations. Does not represent realized investor returns.

Leadership

  • Martin Roscheisen

    Founder & Chief Executive Officer

    LinkedIn
  • Jeremy Scholz

    Co-Founder & Chief Technology Officer

  • Thao A. Nguyen

    Chief Operations Officer

  • Michael Calonico

    VP Finance

    LinkedIn

Competitors

Competitor list is illustrative and may be incomplete, stale, or erroneous.

  • ALTR Created Diamonds

    Lab-grown diamond producer and jewelry brand specializing in ethically produced diamonds.

  • Brilliant Earth

    Leading sustainable and lab-grown diamond jewelry retailer and brand.

  • VRAI

    Fine jewelry brand specializing in ethical lab-grown diamonds powered by renewable energy.

  • Scio Diamond Technology Corporation

    Synthetic diamond technology and production company.

  • Lightbox Jewelry (De Beers)

    De Beers' lab-grown diamond jewelry brand (closed operations in 2025).

  • Pure Grown Diamonds (Gemesis)

    Lab-grown diamond producer and reseller.

Diamond Foundry Investment FAQ

Public status and buying access

No. Diamond Foundry is a private company and does not have a public stock ticker or trade on a public stock exchange. Its shares are generally held by founders, employees, investors, and other private shareholders. Buyers and sellers may be able to transact in Diamond Foundry shares through private secondary transactions, but any transaction depends on share availability, buyer and seller agreement, transfer restrictions, company approval rights, and any applicable right of first refusal. There is no guarantee that Diamond Foundry will complete an IPO or other liquidity event.

Yes, it is sometimes possible to buy Diamond Foundry shares pre-IPO through private secondary transactions. This depends on finding a willing seller, company approval, and satisfying any transfer restrictions or rights of first refusal.

Buyers interested in buying Diamond Foundry shares on the secondary market typically do so through SetterVC and other secondary-market platforms, subject to eligibility requirements, share availability, transfer restrictions, and issuer approval. Buyers may need to satisfy sophistication, accreditation, institutional, platform, regulatory, or other eligibility requirements before participating. Once eligible, buyers may be able to view listings, make bids, and work with a licensed broker through the transaction process. Buyers should ensure they have appropriate legal and financial advisors guiding them before completing any transaction.

The company's latest round valuation was approximately $1.8B as of April 27, 2021. The latest round valuation is often used as one reference point in secondary-market pricing, but secondary prices may be above or below that valuation at any given time. Secondary pricing can shift significantly based on post-round conditions, such as changes in company performance, supply-demand dynamics, share class, transaction size, transfer restrictions, or broader market shifts. Any implied valuation from a past round should be confirmed with a broker or through live market listings before relying on it.

Valuation and funding

Diamond Foundry was most recently valued at approximately $1.8B as of April 27, 2021. This is a private valuation and may differ from secondary pricing. Secondary shares may trade above or below this mark based on various factors. SetterVC and Setter Capital does not verify the accuracy of these valuations. Buyers and sellers should always confirm current valuations before completing any transaction.

Diamond Foundry's valuation has changed over time based on funding rounds, tender offers, secondary-market indications, and other reported or collected valuation marks. Diamond Foundry's valuation moved from approximately $660M as of October 1, 2018 to approximately $1.8B as of April 27, 2021. This comparison reflects company-level valuation marks and does not represent realized investor returns. Secondary-market prices may differ from these valuations based on share class, transaction size, transfer restrictions, supply and demand, company performance, and broader market conditions. SetterVC and Setter Capital does not verify the accuracy or completeness of valuation data, and buyers and sellers should confirm current information before relying on it.

Diamond Foundry's latest disclosed funding round was a Series D round in April 27, 2021. The round raised approximately $200M at an approximately $1.8B valuation, with Fidelity listed as disclosed lead or major investors. Primary funding rounds are different from secondary transactions: in a primary round, capital goes to the company, while in a secondary transaction, investors buy existing shares from current shareholders. Funding-round data reflects publicly reported or collected information and may be incomplete. The latest round valuation should be confirmed before it is used as a pricing reference.

Diamond Foundry has raised approximately $390M in disclosed funding across 3 rounds. These figures reflect primary capital raised by the company and do not include every possible secondary transaction, undisclosed round, debt facility, or private transfer. Reported funding totals can change as new rounds are announced or older round details are corrected. Eligible users can use SetterVC to track Diamond Foundry's funding history alongside private-market activity where available.

Diamond Foundry's disclosed investors include Fidelity, Not publicly disclosed and Angel syndicate. Investor lists are based on public reporting, company announcements, and collected funding-round data, and may be incomplete. Participation in a prior funding round does not mean those investors are currently buying or selling shares. On SetterVC, eligible users can review Diamond Foundry's funding history, valuation history, and private-market activity alongside other venture-backed companies.

Market context

Diamond Foundry's most-cited competitors include ALTR Created Diamonds, Brilliant Earth, VRAI, Scio Diamond Technology Corporation, Lightbox Jewelry (De Beers) and Pure Grown Diamonds (Gemesis). Investors often compare these companies by sector, product focus, valuation, funding raised, growth signals, investor base, and private-market activity.

Secondary-market demand for Diamond Foundry shares can be affected by company performance, revenue growth, profitability, funding history, valuation, investor interest, sector momentum, public-market conditions, expected timing of a liquidity event, and the availability of shares for sale. Demand can also be affected by transfer restrictions, company approval rights, right of first refusal processes, limited information, and the price expectations of buyers and sellers. Strong demand does not guarantee strong pricing, liquidity, or investment returns. Weak demand does not necessarily reflect the company's long-term prospects. Demand signals should not be treated as a recommendation or prediction of investment performance. Buyers and sellers should treat demand signals as informational and conduct their own diligence before transacting.

Selling and transaction mechanics

Sellers often rely on intermediaries and platforms, such as SetterVC and other secondary-market platforms, to identify potential buyers. The exact process varies by company and transaction, but sellers often begin by confirming their ownership, desired price, transferability, and any company approval or notice requirements. If the seller agrees with a buyer on acceptable price and terms, the company may need to be notified through a share transfer notice or similar process. If a right of first refusal, company approval right, or other transfer restriction applies, the seller may need to wait until that process is completed. The parties may then execute a purchase and sale agreement, complete required transfer documentation, and close if all required conditions are satisfied. Sellers should always seek proper legal and financial advice before completing the transaction.

Yes, current and former Diamond Foundry employees, early investors, and other existing shareholders may be able to sell vested shares before an IPO through a private secondary sale. This is not automatic; it depends on whether the shareholder has transferable shares, whether there is buyer demand, and whether the company's governing documents permit the transfer. Many companies require prior notice, company approval, or a right of first refusal before shares can be sold. Sellers should also seek proper legal and financial advice before proceeding.

A Diamond Foundry secondary transaction usually involves an existing shareholder selling shares to a buyer before a public listing. The buyer and seller typically agree on price, number of shares, share class, and closing conditions. The seller may then need to notify Diamond Foundry through a share transfer notice or similar process. If Diamond Foundry or existing investors have approval rights, transfer restrictions, or a right of first refusal, those steps may need to be completed before the transfer can close. The parties typically enter into a purchase and sale agreement, complete any required transfer documentation, and close only if the necessary conditions are satisfied. Timing and certainty can vary by company and transaction.

In most private secondary transactions, parties commonly use a purchase and sale agreement that outlines price, terms, and conditions. They may also use share transfer documentation, often a stock transfer notice, share transfer notice, transfer instruction, or similar document, along with any required company approval or right of first refusal materials. Proof of ownership, such as a cap table entry, share certificate, brokerage statement, issuer confirmation, or administrator confirmation, may also be important. Buyers often request recent company financials, but private companies may limit disclosure. Since every deal varies, buyers and sellers should consult legal and financial advisors to understand which documents are needed.

Risk, diligence, and investor caution

Buying Diamond Foundry shares pre-IPO is risky. Shares are illiquid, no IPO or liquidity event is guaranteed, valuations can change, transfers may require company approval, and private companies may provide limited financial disclosure. Be prepared for total loss. SetterVC and Setter Capital do not provide due diligence, legal, tax, accounting, valuation, or investment advice. Buyers must conduct their own due diligence, verify information, and seek independent legal and investment advice before proceeding.

Private secondary shares are typically illiquid. Unlike public stocks, there is no active public market, so selling them can be difficult and time-consuming. Sales depend on finding a willing buyer and often require company approval. Investors should be prepared to hold the shares for an extended period, with no guarantee of a future sale. Always assess your need for liquidity before investing.

SetterVC and Setter Capital do not provide due diligence, legal, tax, accounting, valuation, or investment advice. Buyers must conduct their own due diligence, including verifying ownership, transferability, legal structure, company approval, and assessing the company's prospects. SetterVC and Setter Capital do not provide advice on whether an investment is good, what price to pay, or what the best bid or ask is. SetterVC and Setter Capital may share documents in some circumstances, but it does not guarantee their accuracy or completeness. Due diligence is essential. Seek legal and investment advice as needed.

Before buying Diamond Foundry shares, a buyer should try to review the share class, price per share, implied valuation, transfer restrictions, ROFR process, company approval rights, seller ownership evidence, recent financing or tender-offer information, available financial information, information rights, resale restrictions, tax considerations, and expected liquidity paths. Not all information may be available for a private company. Buyers should confirm available diligence, process details, and information needs with their own legal, tax, and investment advisers.

SPVs carry risks. Examples include the need to confirm the company allows SPV-based transfers, verify that the SPV truly owns the shares or interests it claims to own, and ensure it has not sold more interests than it holds. Due diligence is essential. Seek legal and investment advice as needed.

Forward contracts carry risks. Examples include the seller refusing to transfer the shares at the future date, even if the seller owns them, the seller going bankrupt with creditors claiming the shares, or the seller committing the same shares to multiple parties. Due diligence is essential. Seek legal and investment advice as needed.

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